fix: validate matcher op for __name__ in promql

[waynexia]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

Closes #5182

What's changed and what's your intention?

We only allow precise equal on __name__ matcher in PromQL.

This behavior is stated in our doc but I forget to add validation https://docs.greptime.com/user-guide/query-data/promql#selector

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

Files not reviewed (2)

• tests/cases/standalone/common/tql/basic.result: Language not supported
• tests/cases/standalone/common/tql/basic.sql: Language not supported

[discord9]

LGTM

[fengjiachun]

LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 83.79%. Comparing base (5469832) to head (be0dcf7).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5191      +/-   ##
==========================================
- Coverage   84.03%   83.79%   -0.25%     
==========================================
  Files        1173     1175       +2     
  Lines      218777   219122     +345     
==========================================
- Hits       183850   183612     -238     
- Misses      34927    35510     +583