Gracefully handle malformed index patterns on role management pages

[legrego]

Summary

Index patterns generally require a title, but it's technically possible to create one without a title (via import, for example). This updates the role management UI to be more resilient against these malformed index patterns.

To test:

• Extract and then import the attached ndjson.zip file via Saved Objects Management
• Attempt to visit the Create/Edit role screen
• Ensure the page renders correctly. Prior to this change, the screen would fail to render altogether.

malformedIndexPattern.ndjson.zip

Resolves #55741

[elasticmachine]

Pinging @elastic/kibana-security (Team:Security)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 582915f
• Storybooks Preview

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
security	764.9KB	765.0KB	+32.0B

Unknown metric groups

References to deprecated APIs

id	before	after	diff
canvas	29	25	-4
fleet	4	2	-2
globalSearch	4	2	-2
total			-8

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[jportner]

Tested locally and works as expected, LGTM 🎉

[kibanamachine]

💚 Backport successful

Status	Branch	Result
✅	7.13
✅	7.x

The backport PRs will be merged automatically after passing CI.