Add NOLINT block to lint.py (#7720)

### What

Add `NOLINT_START`/`NOLINT_END` markers to `lint.py`, to exclude entire
blocks. Useful eg. for documentation, where output of commands is shown
verbatim.

TODO: 
- [x] support NOLINT, etc. for markdown docs too


### Checklist
* [x] I have read and agree to [Contributor
Guide](https://github.com/rerun-io/rerun/blob/main/CONTRIBUTING.md) and
the [Code of
Conduct](https://github.com/rerun-io/rerun/blob/main/CODE_OF_CONDUCT.md)
* [x] I've included a screenshot or gif (if applicable)
* [x] I have tested the web demo (if applicable):
* Using examples from latest `main` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7720?manifest_url=https://app.rerun.io/version/main/examples_manifest.json)
* Using full set of examples from `nightly` build:
[rerun.io/viewer](https://rerun.io/viewer/pr/7720?manifest_url=https://app.rerun.io/version/nightly/examples_manifest.json)
* [x] The PR title and labels are set such as to maximize their
usefulness for the next release's CHANGELOG
* [x] If applicable, add a new check to the [release
checklist](https://github.com/rerun-io/rerun/blob/main/tests/python/release_checklist)!
* [x] If have noted any breaking changes to the log API in
`CHANGELOG.md` and the migration guide

- [PR Build Summary](https://build.rerun.io/pr/7720)
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---------

Co-authored-by: Andreas Reich <[email protected]>

scripts/lint.py

@@ -3,7 +3,8 @@
 """
 Runs custom linting on our code.
 
-Adding "NOLINT" to any line makes the linter ignore that line.
+Adding "NOLINT" to any line makes the linter ignore that line. Adding a pair of "NOLINT_START" and "NOLINT_END" makes
+the linter ignore these lines, as well as all lines in between.
 """
 
 from __future__ import annotations
@@ -849,7 +850,7 @@ def fix_enforced_upper_case(s: str) -> str:
     return "".join(new_words)
 
 
-def lint_markdown(filepath: str, lines_in: list[str]) -> tuple[list[str], list[str]]:
+def lint_markdown(filepath: str, source: SourceFile) -> tuple[list[str], list[str]]:
     """Only for .md files."""
 
     errors = []
@@ -863,12 +864,12 @@ def lint_markdown(filepath: str, lines_in: list[str]) -> tuple[list[str], list[s
     in_code_of_conduct = filepath.endswith("CODE_OF_CONDUCT.md")
 
     if in_code_of_conduct:
-        return errors, lines_in
+        return errors, source.lines
 
     in_code_block = False
     in_frontmatter = False
     in_metadata = False
-    for line_nr, line in enumerate(lines_in):
+    for line_nr, line in enumerate(source.lines):
         line_nr = line_nr + 1
 
         if line.strip().startswith("```"):
@@ -881,7 +882,7 @@ def lint_markdown(filepath: str, lines_in: list[str]) -> tuple[list[str], list[s
         if in_metadata and line.startswith("-->"):
             in_metadata = False
 
-        if not in_code_block:
+        if not in_code_block and not source.should_ignore(line_nr):
             if not in_metadata:
                 # Check the casing on markdown headers
                 if m := re.match(r"(\#+ )(.*)", line):
@@ -973,7 +974,19 @@ def _update_content(self) -> None:
         self.content = "".join(self.lines)
 
         # gather lines with a `NOLINT` marker
-        self.no_lints = {i for i, line in enumerate(self.lines) if "NOLINT" in line}
+        self.nolints = set()
+        is_in_nolint_block = False
+        for i, line in enumerate(self.lines):
+            if "NOLINT" in line:
+                self.nolints.add(i)
+
+            if "NOLINT_START" in line:
+                is_in_nolint_block = True
+
+            if is_in_nolint_block:
+                self.nolints.add(i)
+                if "NOLINT_END" in line:
+                    is_in_nolint_block = False
 
     def rewrite(self, new_lines: list[str]) -> None:
         """Rewrite the contents of the file."""
@@ -993,7 +1006,7 @@ def should_ignore(self, from_line: int, to_line: int | None = None) -> bool:
 
         if to_line is None:
             to_line = from_line
-        return any(i in self.no_lints for i in range(from_line - 1, to_line + 1))
+        return any(i in self.nolints for i in range(from_line - 1, to_line + 1))
 
     def should_ignore_index(self, start_idx: int, end_idx: int | None = None) -> bool:
         """Same as `should_ignore` but takes 0-based indices instead of line numbers."""
@@ -1022,6 +1035,9 @@ def lint_file(filepath: str, args: Any) -> int:
 
     prev_line = None
     for line_nr, line in enumerate(source.lines):
+        if source.should_ignore(line_nr):
+            continue
+
         if line == "" or line[-1] != "\n":
             error = "Missing newline at end of file"
         else:
@@ -1049,7 +1065,7 @@ def lint_file(filepath: str, args: Any) -> int:
             source.rewrite(lines_out)
 
     if filepath.endswith(".md"):
-        errors, lines_out = lint_markdown(filepath, source.lines)
+        errors, lines_out = lint_markdown(filepath, source)
 
         for error in errors:
             print(source.error(error))