Fix the meta description with special characters causing the page to display abnormally

[Contour-D]

What type of PR is this?

/kind bug
/area core

What this PR does / why we need it:

Fix the problem that the meta description with special characters causes the page to display abnormally.
Use htmlEscape in org.springframework.web.util.HtmlUtils to escape the special characters contained in the original description.

see #4000

Which issue(s) this PR fixes:

Fixes #4000

Does this PR introduce a user-facing change?

修复 Meta Description 中含有特殊字符导致页面显示异常的问题。

[CLAassistant]

All committers have signed the CLA.

[Contour-D]

/assign @guqing

[codecov]

Codecov Report

Merging #4031 (54f1831) into main (430b5fb) will decrease coverage by 0.08%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #4031      +/-   ##
============================================
- Coverage     60.60%   60.52%   -0.08%     
+ Complexity     2383     2380       -3     
============================================
  Files           356      356              
  Lines         12316    12317       +1     
  Branches        891      891              
============================================
- Hits           7464     7455       -9     
- Misses         4413     4422       +9     
- Partials        439      440       +1     

Impacted Files	Coverage Δ
...pp/theme/dialect/ContentTemplateHeadProcessor.java	82.69% <100.00%> (+0.33%)	⬆️

... and 5 files with indirect coverage changes

[ruibaby]

/lgtm

[guqing]

/approve

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing

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[ruibaby]

/cherry-pick release-2.6

[halo-dev-bot]

@ruibaby: new pull request created: #4035

In response to this:

/cherry-pick release-2.6

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