Update handleDelete of Collaborators in Console

[nicholaspcr]

Summary

References #6489

Tried making a change on the Console so it uses the new HTTP route to perform collaborator deletion.

Changes

• Update collaborator-form's handleDelete
• Update collaborator actions

Testing

Manual testing and cypress tests should not break with this change.

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• The steps/process to test this feature are clearly explained including testing for regressions.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[nicholaspcr]

On a different note, while looking at the sdk I noticed that

lorawan-stack/sdk/js/src/service/devices/merge.js

Lines 68 to 71 in e374556

	// TODO: Remove this once https://github.com/TheThingsNetwork/lorawan-stack/issues/4766 is resolved.
	if (this.key.endsWith('_at') && e === '0001-01-01T00:00:00Z') {
	return
	}

is still present but the issue is closed. Thought it was worth mentioning.