[Security Solution][Detections] fixes setting timeline to None on bulk edit

[vitaliidm]

Summary

• fixes [Security Solution] Unable to reset to none if rule contains any timeline template under bulk apply timeline template #129294
• makes timelineId/timelineTitle nullable in rule params
• when users set timeline to None, timeline_id and timeline_title will be set to null on bulk edit action (this fixes issue when ruilesClient.bulkEdit can't remove fields from rules, so instead, we set these fields to null)
• haven't touched other parts of timeline editing such as rule create/edit, as it would trigger a lot of changes in schemas. Something I would like to avoid when we are on BC2 stage(https://github.com/elastic/dev/issues/2074)

Checklist

Delete any items that are not applicable to this PR.

• Unit or functional tests were updated or added to match the most common scenarios

For maintainers

• This was checked for breaking API changes and was labeled appropriately

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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
securitySolution	5.6MB	5.6MB	-2.0B

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
securitySolution	254.1KB	254.2KB	+36.0B

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@elasticmachine merge upstream

[vitaliidm]

making timelineId and timelineTitle nullable requires changes in this typing as well

[elasticmachine]

Pinging @elastic/security-detections-response (Team:Detections and Resp)

[elasticmachine]

Pinging @elastic/security-solution (Team: SecuritySolution)

[vitaliidm]

After #137593 is merged, we don't need this one anymore at this time.
If we still consider making timeline_title/timeline_id nullable, PR can be reopened and re-worked