[Security Solution][Exceptions]- Increase exceptions test coverage

[WafaaNasr]

Summary

• Addresses https://github.com/elastic/security-team/issues/5947
• Adding tests to cover the yellow rows in test sheet
• Organise the tests to correspond to the following structure
• Removed the x-pack/plugins/security_solution/cypress/e2e/exceptions/alerts_table_flow/add_exception.cy.ts as it was duplicated from x-pack/plugins/security_solution/cypress/e2e/exceptions/exceptions_management_flow/exceptions_table.cy.ts
• Skipped the flyout_validation tests until resolving this ticket
• Regarding Exception-List, Exception-List-Item and Rule with exceptions migrations test cases are handled by most of our old FTR tests as most of them deal with Exception List Schema which doesn't include the new props, like the expire_time that was introduced in 8.7, so adding new tests using the new schema can be treated as testing the new versions against the existing scenarios whereas the existing tests for the migrations (downgrade) tests 4a75a51
• Tests under x-pack/plugins/security_solution/cypress/upgrade_e2e are just POCs can't be used

New tests folder structure based on workflow

[MadameSheema]

Lots of thanks for helping improving the test coverage!!

To minimize the risk of flakiness in a future, would be nice to load the default auditbeat archive in the after hook where we use the reset kibana method.

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: abcba1b

Failed CI Steps

• Defend Workflows Cypress Tests #1

Test Failures

• [job] [logs] Defend Workflows Cypress Tests #1 / Isolate command from Manage "before all" hook for "should allow filtering endpoint by Isolated status"

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	10.8MB	10.8MB	+215.0B

Unknown metric groups

ESLint disabled line counts

id	before	after	diff
enterpriseSearch	19	21	+2
securitySolution	413	417	+4
total			+6

Total ESLint disabled count

id	before	after	diff
enterpriseSearch	20	22	+2
securitySolution	497	501	+4
total			+6

History

• 💔 Build #133267 failed d49bd16
• 💛 Build #132852 was flaky dfaf2c9
• 💛 Build #132487 was flaky 0e5f52f
• 💔 Build #132259 failed 3671938
• 💔 Build #132200 failed c494b59

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

cc @WafaaNasr