[backport 2.8] Replace re2 with RegExp in timeline and add unit tests

[ananzh]

Description

Remove re2 usage and replace it with JavaScript built-in RegExp object. Also add more unit tests to make sure that using RegExp has same expressions as using re2 library.

Issue Resolve

#3901

Backport PR

#3908

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

Merging #4208 (2620585) into 2.8 (4ae0e3f) will decrease coverage by 0.06%.
The diff coverage is 72.41%.

@@            Coverage Diff             @@
##              2.8    #4208      +/-   ##
==========================================
- Coverage   66.35%   66.30%   -0.06%     
==========================================
  Files        3229     3229              
  Lines       62091    62093       +2     
  Branches     9611     9612       +1     
==========================================
- Hits        41201    41168      -33     
- Misses      18570    18599      +29     
- Partials     2320     2326       +6     

Flag	Coverage Δ
Linux	66.30% <72.41%> (-0.01%)	⬇️
Windows	?

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

Impacted Files	Coverage Δ
src/core/server/plugins/types.ts	100.00% <ø> (ø)
src/core/server/plugins/plugins_system.ts	91.13% <41.66%> (ø)
src/dev/build/tasks/patch_native_modules_task.ts	90.32% <85.71%> (+4.11%)	⬆️
...server/plugins/discovery/plugin_manifest_parser.ts	82.14% <100.00%> (ø)
src/core/server/plugins/plugin.ts	100.00% <100.00%> (ø)
...vis_type_timeline/server/series_functions/label.js	100.00% <100.00%> (ø)

... and 8 files with indirect coverage changes

[joshuarrrr]

whitesource check can be ignored.