fix(apollo-react): preserve task order when creating parallel group with task below [MST-7790]

[SreedharAvvari]

Before

image.2026-03-23.at.11.15.28.AM.mov

After

image.2026-03-23.at.11.14.13.AM.mov

[github-actions]

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Project	Deployment	Review	Updated (PT)
apollo-canvas	🟢 Ready	Preview, Logs	Mar 22, 2026, 10:04:44 PM
apollo-landing	🟢 Ready	Preview, Logs	Mar 22, 2026, 10:01:51 PM
apollo-ui-react	🟢 Ready	Preview, Logs	Mar 22, 2026, 10:03:49 PM
apollo-vertex	🟢 Ready	Preview, Logs	Mar 22, 2026, 10:02:59 PM
apollo-wind	🟢 Ready	Preview, Logs	Mar 22, 2026, 10:02:44 PM

[github-actions]

Dependency License Review

• ✅ 1916 package(s) scanned
• ✅ No license issues found
• ⚠️ 3 package(s) excluded (see details below)

License distribution

License	Packages
MIT	1681
ISC	89
Apache-2.0	56
BSD-3-Clause	28
BSD-2-Clause	23
BlueOak-1.0.0	8
MPL-2.0	5
MIT OR Apache-2.0	3
MIT-0	3
CC0-1.0	3
LGPL-3.0-or-later	2
(MIT OR Apache-2.0)	2
Unlicense	2
Python-2.0	1
CC-BY-4.0	1
(MPL-2.0 OR Apache-2.0)	1
Unknown	1
Artistic-2.0	1
(WTFPL OR MIT)	1
(BSD-2-Clause OR MIT OR Apache-2.0)	1
CC-BY-3.0	1
0BSD	1
(MIT OR CC0-1.0)	1
MIT AND ISC	1

Excluded packages

Package	Version	License	Reason
@img/sharp-libvips-linux-x64	1.2.4	LGPL-3.0-or-later	LGPL pre-built binary, not linked
@img/sharp-libvips-linuxmusl-x64	1.2.4	LGPL-3.0-or-later	LGPL pre-built binary, not linked
khroma	2.1.0	Unknown	MIT per GitHub repo, missing license field in package.json

[Copilot]

Pull request overview

Fixes task ordering when merging a task into the parallel group below, ensuring the moved task preserves its original relative position (above the tasks it’s merged with) in the resulting group.

Changes:

• Update mergeGroupDown to prepend the moved task to the group below (instead of appending).
• Adjust unit tests to assert the new, order-preserving merge behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/apollo-react/src/canvas/utils/GroupModificationUtils.ts	Changes mergeGroupDown to place the moved task before the below group’s existing tasks to preserve order.
packages/apollo-react/src/canvas/utils/GroupModificationUtils.test.ts	Updates expectations for mergeGroupDown tests to match the corrected ordering behavior.