fix: classloaders in Sermant should not load implementations of SPI interface from parent classloader

[lilai23]

What type of PR is this?

Bug

What this PR does / why we need it?

Due to class isolation, the service loader does not obtain the service provider from the parent classloader, but returns only the SPI resources in current classloader

Which issue(s) this PR fixes？

Fixes #1685

Does this PR introduce a user-facing change?

No

Checklist

• Make sure there is a GitHub_issue related with this PR before you start working on it.
• Make sure you have squashed your change to one single commit.
• GitHub Actions works fine in this PR.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ant/core/plugin/classloader/PluginClassLoader.java	0.00%	3 Missing ⚠️

Flag	Coverage Δ	Complexity Δ
unittests	43.88% <0.00%> (-0.01%)	181.00 <0.00> (ø)

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

Files with missing lines	Coverage Δ	Complexity Δ
...ant/core/plugin/classloader/PluginClassLoader.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)

... and 3 files with indirect coverage changes