feat: add api exit calls column to trace views

[arjunlalb]

Description

Add Exit calls column to trace views.

Testing

Manual verification done.

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 #643 (6b1fd97) into main (b43ce2e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #643   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files         778      778           
  Lines       16030    16030           
  Branches     2068     2068           
=======================================
  Hits        13662    13662           
  Misses       2333     2333           
  Partials       35       35           

Impacted Files	Coverage Δ
...apis/api-detail/traces/api-trace-list.dashboard.ts	100.00% <ø> (ø)
...vice-detail/traces/service-trace-list.dashboard.ts	100.00% <ø> (ø)
...y/src/pages/explorer/explorer-dashboard-builder.ts	88.88% <ø> (ø)
projects/observability/src/public-api.ts	100.00% <ø> (ø)

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[kotharironak]

LGTM, Have verified locally by using docker-compose set up by using this and PR - hypertrace/hypertrace-service#74
hypertrace/hypertrace-service#74 (comment)

Holding for full implementation

[arjunlalb]

@aaron-steinfeld Full implementation of this feature has been done.

[github-actions]

Unit Test Results

    4 files  ±0  242 suites  ±0   14m 38s ⏱️ +41s
869 tests ±0  869 ✔️ ±0  0 💤 ±0  0 ❌ ±0 
873 runs  ±0  873 ✔️ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 5d93503. ± Comparison against base commit b43ce2e.