refactor: optimizing regex pettern for html meta matching

[guqing]

What type of PR is this?

/kind improvement
/area core
/milestone 2.8.x

What this PR does / why we need it:

优化去除 Html Meta 重复标签的正则表达式

see #4234 for more details.

Which issue(s) this PR fixes:

Fixes #4234

Does this PR introduce a user-facing change?

优化去除 Html Meta 重复标签的正则表达式

[codecov]

Codecov Report

Merging #4235 (d26e288) into main (1dc2f6f) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               main    #4235   +/-   ##
=========================================
  Coverage     60.18%   60.18%           
+ Complexity     2414     2413    -1     
=========================================
  Files           366      366           
  Lines         12586    12586           
  Branches        906      905    -1     
=========================================
  Hits           7575     7575           
  Misses         4571     4571           
  Partials        440      440           

Impacted Files	Coverage Δ
...o/app/theme/dialect/DuplicateMetaTagProcessor.java	100.00% <100.00%> (ø)

[guqing]

/cherry-pick release-2.7.0

[halo-dev-bot]

@guqing: once the present PR merges, I will cherry-pick it on top of release-2.7.0 in a new PR and assign it to you.

In response to this:

/cherry-pick release-2.7.0

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[JohnNiang]

似乎缺少对应的测试用例。

[guqing]

似乎缺少对应的测试用例。

添加了对应正则的测试用例

[guqing]

/cc @halo-dev/sig-halo

[f2c-ci-robot]

@guqing: GitHub didn't allow me to request PR reviews from the following users: halo-dev/sig-halo.

Note that only halo-dev members and repo collaborators can review this PR, and authors cannot review their own PRs.

In response to this:

/cc @halo-dev/sig-halo

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[JohnNiang]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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[halo-dev-bot]

@guqing: cannot checkout release-2.7.0: error checking out release-2.7.0: exit status 1. output: error: pathspec 'release-2.7.0' did not match any file(s) known to git

In response to this:

/cherry-pick release-2.7.0

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.