[Security Solution] Fix the total installed rules counter

[xcrzx]

Resolves: #159795

Summary

Fixes the total rules counter to be installed prebuilt rules + custom rules instead of the number of filtered rules.

[elasticmachine]

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

[elasticmachine]

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

[jpdjere]

LGTM 👍 Thanks!

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: 2644a3d

Failed CI Steps

• Security Solution Tests #5
• Explore - Security Solution Tests #2

Test Failures

• [job] [logs] Security Solution Tests #5 / Add, copy comments in different exceptions type and validate sharing them between users Endpoint exceptions Add comment on a new exception, and add another comment has unicode character from a different user
• [job] [logs] Explore - Security Solution Tests #2 / Entity Analytics Dashboard With anomalies data renders table with pagination

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	11.0MB	11.0MB	+132.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	13	15	+2
securitySolution	411	415	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	14	16	+2
securitySolution	494	498	+4
total			+6

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

cc @xcrzx