[Security Solution] Expand test coverage for performing rule field upgrades to all diffable fields

[jpdjere]

Partially resolves: #202078

NOTE: This PR builds, refactors (and corrects parts of) #205217. Only the last commit in this PR (dbb5b23) actually addresses the description mentioned below. All others belong to #205217. This PR will probably need a rebase after #205217 is merged.

Summary

• Refactors and expands upgrade/_perform integrations tests in ALL_RULES and SPECIFIC_RULES to cover all diffable fields.
• Extracts out all mock data for tests used for integration tests of both upgrade/_review and upgrade/_perform endpoints into its own file.

Flaky test run

🕐 https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/7638

Checklist

Check the PR satisfies following conditions.

Reviewers should verify this PR satisfies this list as well.

• Flaky Test Runner was used on any tests changed
• The PR description includes the appropriate Release Notes section, and the correct release_note:* label is applied per the guidelines

[elasticmachine]

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

[elasticmachine]

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

[elasticmachine]

Pinging @elastic/security-detection-rule-management (Team:Detection Rule Management)

[elasticmachine]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: dbb5b23

Failed CI Steps

• test/functional/apps/discover/group3/config.ts

Test Failures

• [job] [logs] test/functional/apps/discover/group3/config.ts / discover/group3 discover request counts ES|QL mode should send no more than 2 search requests (documents + chart) on page load

Metrics [docs]

✅ unchanged

cc @jpdjere

[kibanamachine]

Flaky Test Runner Stats

🟠 Some tests failed. - kibana-flaky-test-suite-runner#7638

[❌] x-pack/test/security_solution_api_integration/test_suites/detections_response/rules_management/prebuilt_rules/management/trial_license_complete_tier/configs/ess.config.ts: 75/100 tests passed.
[✅] x-pack/test/security_solution_api_integration/test_suites/detections_response/rules_management/prebuilt_rules/management/trial_license_complete_tier/configs/serverless.config.ts: 100/100 tests passed.

see run history