Minor optimizations in getComponentDescriptorForTarget (#6306)

**Problem:**
1. Let's early return for intrinsic elements, which are not component
instances, so no reason to search for component descriptors at all.
2. Let's remove the regex replaces which remove file extensions and
replace them with `stripExtension` function calls, which are
significantly faster.
3. 
**Manual Tests:**
I hereby swear that:

- [x] I opened a hydrogen project and it loaded
- [x] I could navigate to various routes in Preview mode

editor/src/core/property-controls/property-controls-utils.ts

@@ -27,6 +27,7 @@ import { getFilePathMappings } from '../model/project-file-utils'
 import { valueDependentCache } from '../shared/memoize'
 import * as EP from '../shared/element-path'
 import { shallowEqual } from '../shared/equality-utils'
+import { stripExtension } from '../../components/custom-code/custom-code-utils'
 
 export function propertyControlsForComponentInFile(
   componentName: string,
@@ -170,6 +171,10 @@ function getComponentDescriptorForTargetInner(
       underlyingFilePath: string,
     ) => {
       if (isJSXElement(element)) {
+        if (isIntrinsicElement(element.name)) {
+          return null
+        }
+
         const importedFrom = importedFromWhere(
           filePathMappings,
           underlyingFilePath,
@@ -180,11 +185,7 @@ function getComponentDescriptorForTargetInner(
 
         let filenameForLookup: string | null = null
         if (importedFrom == null) {
-          if (isIntrinsicElement(element.name)) {
-            return null
-          } else {
-            filenameForLookup = underlyingFilePath.replace(/\.(js|jsx|ts|tsx)$/, '')
-          }
+          filenameForLookup = stripExtension(underlyingFilePath)
         } else {
           filenameForLookup = importedFrom.filePath
         }
@@ -216,7 +217,7 @@ function getComponentDescriptorForTargetInner(
           )
 
           const trimmedPath = absolutePath.includes('/')
-            ? absolutePath.replace(/\.(js|jsx|ts|tsx)$/, '')
+            ? stripExtension(absolutePath)
             : absolutePath
 
           return propertyControlsInfo[trimmedPath]?.[nameAsString]