feat: react-hook-form field array for provider muxes

[alex-mcgovern]

Integrates the useFieldArray hook from react-hook-form to add zod-schema driven validation to the Muxing config.

Closes #367 — which originated from a user issue on Github

[stacklok-cloud-staging]

Minder Vulnerability Report ✅

Minder analyzed this PR and found it does not add any new vulnerable dependencies.

Vulnerability scan of 48e7ed2a:

• 🐞 vulnerable packages: 0
• 🛠 fixes available for: 0

[alex-mcgovern]

temporary state, will be resolved before merge, same for other form-* components in this tmp directory

[coveralls]

Pull Request Test Coverage Report for Build 13903674755

Details

• 63 of 93 (67.74%) changed or added relevant lines in 21 files are covered.
• 50 unchanged lines in 4 files lost coverage.
• Overall coverage decreased (-4.6%) to 61.874%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/features/workspace/components/form-mux-button-delete-rule.tsx	1	2	50.0%
src/features/workspace/components/form-mux-context-provider.tsx	6	7	85.71%
src/features/workspace/components/tmp/form-discard-changes-button.tsx	2	3	66.67%
src/features/workspace/components/tmp/form-submit-button.tsx	0	1	0.0%
src/features/workspace/lib/handle-mux-form-errors.ts	5	6	83.33%
src/features/workspace/components/form-mux-rules.tsx	12	14	85.71%
src/features/workspace/components/tmp/form-radio-group.tsx	0	5	0.0%
src/features/workspace/components/tmp/form-reset-on-submit.tsx	0	5	0.0%
src/features/workspace/components/tmp/form-checkbox-group.tsx	0	6	0.0%
src/features/workspace/components/form-mux-fields-array.tsx	2	9	22.22%

Files with Coverage Reduction	New Missed Lines	%
src/components/SortableArea.tsx	3	0.0%
src/features/workspace/lib/utils.ts	8	0.0%
src/features/workspace/hooks/use-muxing-rules-form-workspace.ts	19	0.0%
src/features/workspace/components/workspace-models-dropdown.tsx	20	0.0%

Totals
Change from base Build 13900755380:	-4.6%
Covered Lines:	904
Relevant Lines:	1379

---

💛 - Coveralls