feat(select): add support for a separate selected label

[arjunlalb]

Description

Add support for a separate selectedLabel for select options in select component.

In some cases we'd want to show a different label when the action is selected. For example, when the option is an action like 'Resolve', we'd want to show 'Resolved' when that option is selected.

Testing

UTs added.

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

Merging #607 (3b83b23) into main (abcfcad) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #607   +/-   ##
=======================================
  Coverage   85.15%   85.15%           
=======================================
  Files         768      768           
  Lines       15861    15862    +1     
  Branches     2037     2037           
=======================================
+ Hits        13506    13507    +1     
  Misses       2322     2322           
  Partials       33       33           

Impacted Files	Coverage Δ
projects/components/src/select/select.component.ts	94.54% <ø> (ø)
...s/components/src/select/select-option.component.ts	100.00% <100.00%> (ø)

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[github-actions]

Unit Test Results

    4 files  ±0  235 suites  ±0   14m 0s ⏱️ -23s
844 tests ±0  844 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
848 runs  ±0  848 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 9fa4519. ± Comparison against base commit abcfcad.