[Security Solution][Endpoint] Fix event filter creation success toast

[ashokaditya]

Summary

Shows a success toast when the first-ever event filter is added to the event filters page.

clip showing add/edit

Checklist

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

[elasticmachine]

Pinging @elastic/security-onboarding-and-lifecycle-mgt (Team:Onboarding and Lifecycle Mgt)

[kibana-ci]

💚 Build Succeeded

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• Commit: d4b797f
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Metrics [docs]

Unknown metric groups

ESLint disabled in files

id	before	after	diff
apm	15	14	-1
osquery	5	4	-1
securitySolution	69	68	-1
uptime	7	6	-1
total			-4

ESLint disabled line counts

id	before	after	diff
apm	88	85	-3
enterpriseSearch	9	7	-2
fleet	47	46	-1
osquery	122	119	-3
uptime	49	43	-6
total			-15

References to deprecated APIs

id	before	after	diff
canvas	70	64	-6
dashboard	78	72	-6
data	475	465	-10
dataEnhanced	55	49	-6
discover	26	20	-6
fleet	20	19	-1
lens	18	14	-4
management	2	1	-1
maps	456	330	-126
monitoring	40	28	-12
upgradeAssistant	12	7	-5
visDefaultEditor	205	155	-50
visTypeVega	4	3	-1
visualizations	17	13	-4
total			-238

Total ESLint disabled count

id	before	after	diff
apm	103	99	-4
enterpriseSearch	9	7	-2
fleet	55	54	-1
osquery	127	123	-4
securitySolution	509	508	-1
uptime	56	49	-7
total			-19

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

cc @ashokaditya

[kibanamachine]

⚪ Backport skipped

The pull request was not backported as there were no branches to backport to. If this is a mistake, please apply the desired version labels or run the backport tool manually.

Manual backport

To create the backport manually run:

node scripts/backport --pr 128810

Questions ?

Please refer to the Backport tool documentation