[7.11] Remove onAppLeave in useEffectCleanup to prevent confirm when leaving from listing page (#89041)

[ThomThomson]

Backports the following commits to 7.11:

• Remove onAppLeave in useEffectCleanup to prevent confirm when leaving from listing page (Fix Warning When Leaving from Visualize Listing Page #89041)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a5589fc

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
triggersActionsUi	1.5MB	1.5MB	-26.9KB
visualize	131.2KB	131.3KB	+51.0B
total			-26.8KB

Page load bundle

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

id	before	after	diff
triggersActionsUi	162.3KB	162.4KB	+102.0B

Unknown metric groups

async chunk count

id	before	after	diff
triggersActionsUi	31	32	+1

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