feat: support k8s labels for dashboards

[arkbriar]

I hereby agree to the terms of the RisingWave Labs, Inc. Contributor License Agreement.

What's changed and what's your intention?

The PR supports labels pod and risingwave_component available in k8s deployments to replace the original labels instance and job used locally, as described in #13174.

In general, it introduced a set of variables to represent the labels and variables used in queries. The PR should not change the local dashboard. I have run the generate.sh to update the dashboards accordingly. There's no change to the user's dashboard and the changes to the dev dashboard are all trivial formats (like removing blanks or adding blanks). You can find a diff here.

grafana-dev-dashboard.diff.txt

Fixes #13174

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• I have added fuzzing tests or opened an issue to track them. (Optional, recommended for new SQL features Sqlsmith: Sql feature generation #7934).
• My PR contains breaking changes. (If it deprecates some features, please create a tracking issue to remove them in the future).
• All checks passed in ./risedev check (or alias, ./risedev c)
• My PR changes performance-critical code. (Please run macro/micro-benchmarks and show the results.)

• My PR contains critical fixes that are necessary to be merged into the latest release. (Please check out the details)

Documentation

• My PR needs documentation updates. (Please use the Release note section below to summarize the impact on users)

Release note

If this PR includes changes that directly affect users or other significant modifications relevant to the community, kindly draft a release note to provide a concise summary of these changes. Please prioritize highlighting the impact these changes will have on users.

[hzxa21]

LGTM!

Thanks for the efforts.

[codecov]

Codecov Report

Merging #13209 (651396d) into main (0007064) will decrease coverage by 0.06%.
The diff coverage is n/a.

❗ Current head 651396d differs from pull request most recent head 9969a69. Consider uploading reports for the commit 9969a69 to get more accurate results

@@            Coverage Diff             @@
##             main   #13209      +/-   ##
==========================================
- Coverage   68.13%   68.08%   -0.06%     
==========================================
  Files        1515     1512       -3     
  Lines      257111   256245     -866     
==========================================
- Hits       175192   174454     -738     
+ Misses      81919    81791     -128     

Flag	Coverage Δ
rust	68.08% <ø> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

see 32 files with indirect coverage changes

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[arkbriar]

Updates: resolve conflicts and force push.