style: improve select component and global color tokens style

[erha19]

Types

• 💄 Style Changes

Background or solution

close #1678.

调整自定义 ColorToken 注册 fallback 色值，使框架更贴合主题效果

修改后:

Changelog

• improve select component and global color tokens style

[Ricbet]

LGTM

[codecov]

Codecov Report

Base: 57.58% // Head: 57.58% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (cdb67ce) compared to base (a72de19).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##            v2.20    #1683   +/-   ##
=======================================
  Coverage   57.58%   57.58%           
=======================================
  Files        1255     1255           
  Lines       78349    78360   +11     
  Branches    16406    16413    +7     
=======================================
+ Hits        45115    45125   +10     
  Misses      30237    30237           
- Partials     2997     2998    +1     

Flag	Coverage Δ
jsdom	52.39% <100.00%> (+<0.01%)	⬆️
node	15.82% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...ges/theme/src/common/color-tokens/custom/button.ts	100.00% <ø> (ø)
...kages/theme/src/common/color-tokens/custom/icon.ts	100.00% <100.00%> (ø)
...ages/theme/src/common/color-tokens/custom/input.ts	100.00% <100.00%> (ø)
...ges/theme/src/common/color-tokens/custom/select.ts	100.00% <100.00%> (ø)
...extension/src/hosted/api/sumi/ext.host.api.impl.ts	89.65% <0.00%> (-3.21%)	⬇️
...ion/src/browser/vscode/api/main.thread.treeview.ts	48.77% <0.00%> (+0.66%)	⬆️
packages/core-common/src/node/port.ts	47.76% <0.00%> (+2.98%)	⬆️

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