[Security Solution] Fix "Expression produces a union type that is too complex to represent" TS error

[xcrzx]

Related to: #104470, #100563

Summary

This PR fixes "Expression produces a union type that is too complex to represent." which appears after upgrade to Typescript 4.3.

[elasticmachine]

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

[elasticmachine]

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

[FrankHassanabad]

LGTM, looked over the code, this looks good.

[kibanamachine]

💛 Build succeeded, but was flaky

• continuous-integration/kibana-ci/pull-request

• Commit: 3c0964f

• Storybooks Preview

• Flaky suites:

  • xpack-securitySolutionCypressChrome

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Test Failures

Kibana Pipeline / general / Creates and activates a new custom rule with override option.Detection rules, override Creates and activates a new custom rule with override option

Link to Jenkins

Stack Trace

Failed Tests Reporter:
  - Test has failed 18 times on tracked branches: https://github.com/elastic/kibana/issues/84020

AssertionError: Timed out retrying after 60000ms: Expected to find content: '80' within the element: <div.euiDataGridRowCell.euiDataGridRowCell--numeric> but never did.
    at Context.eval (http://localhost:6121/__cypress/tests?p=cypress/integration/detection_rules/override.spec.ts:21940:48)

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Metrics [docs]

✅ unchanged

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

cc @xcrzx

[kibanamachine]

💚 Backport successful

Status	Branch	Result
✅	7.x

This backport PR will be merged automatically after passing CI.