fix: Expand Contract button and Removing line

[palbizu]

Description

• Expand / Collapse button color changed when open (a variable was added to allow customization)
• Left lateral dotted line was removed and the padding was adjusted to that position.

Testing

Visual test.

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

Documentation

Make sure that you have documented corresponding changes in this repository or hypertrace docs repo if required.

[codecov]

Codecov Report

Merging #653 (da68c2e) into main (10ba244) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #653   +/-   ##
=======================================
  Coverage   85.20%   85.20%           
=======================================
  Files         777      777           
  Lines       16017    16017           
  Branches     2066     2066           
=======================================
  Hits        13647    13647           
  Misses       2335     2335           
  Partials       35       35           

Impacted Files	Coverage Δ
...mponents/src/expander/expander-toggle.component.ts	100.00% <ø> (ø)

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[github-actions]

Unit Test Results

    4 files  ±0  241 suites  ±0   15m 17s ⏱️ +33s
866 tests ±0  866 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
870 runs  ±0  870 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 797268e. ± Comparison against base commit 10ba244.