[7.x] [Security Solution] [Cases] Follow up jest tests for #84587 (#86231)

[stephmilovic]

Backports the following commits to 7.x:

• [Security Solution] [Cases] Follow up jest tests for [Security Solution] [Cases] Move field mappings from actions to cases #84587 ([Security Solution] [Cases] Follow up jest tests for #84587 #86231)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: eeb7d4a

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	8.5MB	8.5MB	-655.0B
triggersActionsUi	1.5MB	1.5MB	-26.9KB
total			-27.5KB

Distributable file count

id	before	after	diff
default	47560	48323	+763

Page load bundle

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

id	before	after	diff
triggersActionsUi	162.0KB	162.1KB	+102.0B

Unknown metric groups

async chunk count

id	before	after	diff
triggersActionsUi	31	32	+1

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