test: switch to splitted bats test

[binbin-li]

Description

What this PR does / why we need it:

This pr is following #860, which splitted test.bats into base-test.bats and plugin-test.bats. We'll just need to run those 2 files instead of the original one.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):

Fixes #

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Helm Chart Change (any edit/addition/update that is necessary for changes merged to the main branch)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• Does the affected code have corresponding tests?
• Are the changes documented, not just with inline documentation, but also with conceptual documentation such as an overview of a new feature, or task-based documentation like a tutorial? Consider if this change should be announced on your project blog.
• Does this introduce breaking changes that would require an announcement or bumping the major version?
• Do all new files have appropriate license header?

Post Merge Requirements

• MAINTAINERS: manually trigger the "Publish Package" workflow after merging any PR that indicates Helm Chart Change

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.06 🎉

Comparison is base (6ed81c8) 54.96% compared to head (06341ba) 55.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #870      +/-   ##
==========================================
+ Coverage   54.96%   55.03%   +0.06%     
==========================================
  Files          80       80              
  Lines        4739     4739              
==========================================
+ Hits         2605     2608       +3     
+ Misses       1850     1848       -2     
+ Partials      284      283       -1     

see 1 file with indirect coverage changes

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