Update edit blob to use commit change modal (!174287) · Merge requests · GitLab.org / GitLab

What does this MR do and why?

Update to use commit modal in edit blob flow. Note, the first attempt of this feature was reverted and included as first commit in this MR. Since then the notable changes are:

Instead of leveraging hidden input fields, pass down a custom form submit handler
In the handler, append data that's unique to edit blob flow
Wrap the data with Object.entries to maintain line ending in the file content
Add tests

References

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first attempt !170512 (merged)
why it was reverted #505023 (closed)
since then, commit_changes_modal changes have been shipped in !173620 (merged)

MR acceptance checklist

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