fix: inconsistent proxy cache when multiple DDL is executing with DML

[chyezh]

issue: #45697

[sre-ci-robot]

[ci-v2-notice] Notice: We are gradually rolling out the new ci-v2 system.

• Legacy CI jobs remain unaffected, you can just ignore ci-v2 if you don't want to run it.
• Additional "ci-v2/*" checkers will run for this PR to ensure the new ci-v2 system is working as expected.
• For tests that exist in both v1 and v2, passing in either system is considered PASS.

To rerun ci-v2 checks, comment with:

• /ci-rerun-code-check // for ci-v2/code-check
• /ci-rerun-build // for ci-v2/build
• /ci-rerun-ut-integration // for ci-v2/ut-integration
• /ci-rerun-ut-go // for ci-v2/ut-go
• /ci-rerun-ut-cpp // for ci-v2/ut-cpp
• /ci-rerun-ut // for all ci-v2/ut-integration, ci-v2/ut-go, ci-v2/ut-cpp
• /ci-rerun-e2e-arm // for ci-v2/e2e-arm

If you have any questions or requests, please contact @zhikunyao.

[codecov[bot]]

Codecov Report

:x: Patch coverage is 57.14286% with 3 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 76.48%. Comparing base (8ee8c01) to head (e9081b0). :warning: Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/proxy/meta_cache.go	57.14%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #45698      +/-   ##
==========================================
- Coverage   76.51%   76.48%   -0.04%     
==========================================
  Files        1875     1875              
  Lines      292559   292564       +5     
==========================================
- Hits       223865   223770      -95     
- Misses      61271    61363      +92     
- Partials     7423     7431       +8     

Components	Coverage Δ
Client	78.17% <ø> (ø)
Core	83.19% <ø> (ø)
Go	74.59% <57.14%> (-0.05%)	:arrow_down:

Files with missing lines	Coverage Δ
internal/proxy/meta_cache.go	88.34% <57.14%> (-0.42%)	:arrow_down:

... and 29 files with indirect coverage changes

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chyezh, czs007

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• ~~internal/proxy/OWNERS~~ [czs007]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[mergify[bot]]

@chyezh cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[chyezh]

/run-cpu-e2e

[mergify[bot]]

@chyezh cpu-e2e job failed, comment /run-cpu-e2e can trigger the job again.

[chyezh]

/run-cpu-e2e