[Interactive Graph] Remove the start-coords-ui flags

[nishasy]

Summary:

Now that start coords UI for all graph types have been
safely out for a while now, we can remove the start-coords-ui-*
flags from Perseus.

Next, we can remove them from webapp and Growthbook.

Issue: https://khanacademy.atlassian.net/browse/LEMS-2228

Test plan:

yarn jest
yarn typecheck

• The the perseus repo in your IDE, seach for all instances of start-coords-ui and confirm there are none left.
• Confirm there are also no instances of TODO(LEMS-2228) left.

Storybook

• Go to http://localhost:6006/?path=/story/perseuseditor-widgets-interactive-graph--interactive-graph-segment (as well as all the other graphs' stories)
• Confirm that the start coords UI show up
• Confirm that the start coords UI does not show up for unlimited points, unlimited polygons, or polygons with snapTo angles or sides

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (8e44460) and published it to npm. You
can install it using the tag PR1609.

Example:

yarn add @khanacademy/perseus@PR1609

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1609

[github-actions]

Size Change: -365 B (-0.04%)

Total Size: 860 kB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	277 kB	-365 B (-0.13%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.3 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/index.js	417 kB
packages/perseus/dist/es/strings.js	3.36 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/bright-hairs-jog.md, packages/perseus/src/types.ts, packages/perseus-editor/src/__stories__/flags-for-api-options.ts, packages/perseus-editor/src/components/util.ts, packages/perseus-editor/src/widgets/__tests__/interactive-graph-editor.test.tsx, packages/perseus-editor/src/widgets/interactive-graph-editor/interactive-graph-editor.tsx

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.45%. Comparing base (737fe30) to head (8e44460).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1609      +/-   ##
==========================================
- Coverage   70.49%   70.45%   -0.05%     
==========================================
  Files         548      573      +25     
  Lines      107300   111730    +4430     
  Branches     7828    11845    +4017     
==========================================
+ Hits        75639    78714    +3075     
- Misses      31545    33016    +1471     
+ Partials      116        0     -116     

see 1121 files with indirect coverage changes

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