remove sub working directory for gantt-chart

[joshuali925]

Description

after opensearch-project/dashboards-visualizations#321, there will be no need to specify build script and working directory.

This is tested on fork using ./build.sh manifests/3.0.0/opensearch-dashboards-3.0.0.yml --component OpenSearch-Dashboards ganttChartDashboards. tested on 3.0.0, 2.12.0, 1.3.14

Note

In all future release versions (>=3.0.0, >=2.12.0, >=1.3.15), the manifest file should not include working_directory: gantt-chart. This seems to be done manually (e.g. #4264). cc. @zelinh

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Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (88b16f9) 91.35% compared to head (220c109) 91.35%.
Report is 13 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4375   +/-   ##
=======================================
  Coverage   91.35%   91.35%           
=======================================
  Files         190      190           
  Lines        6197     6197           
=======================================
  Hits         5661     5661           
  Misses        536      536           

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[joshuali925]

converting to draft until opensearch-project/dashboards-visualizations#321 gets merged

Edit: pending backports opensearch-project/dashboards-visualizations#323, opensearch-project/dashboards-visualizations#325

Edit: removed draft status since all PRs are merged in dashboards-visualizations

[derek-ho]

Nice, do we want to make the change for 2.12?

[joshuali925]

Nice, do we want to make the change for 2.12?

replied in opensearch-project/dashboards-visualizations#321 (comment)

[vamsimanohar]

LGTM

[gaiksaya]

@prudhvigodithi Any objections to merge this?