…eview (Rule Updates table) v2 (elastic#205922)

**Addresses:** elastic#202078

## Summary

This PR extends rule upgrade test plan with customizable and
non-customizable field examples. Rule upgrade workflow test plan
(excluding Rule Upgrade flyout) was initially extended in
elastic#203331.

elastic#203331 adds the following rule
upgrade workflow scenarios

- Scenario: User can upgrade conflict-free prebuilt rules one by one
- Scenario: User cannot upgrade prebuilt rules one by one from Rules
Update table if they have conflicts
- Scenario: User can upgrade multiple conflict-free prebuilt rules
selected on the page
- Scenario: User cannot upgrade selected prebuilt rules with conflicts
- Scenario: User can upgrade all available conflict-free prebuilt rules
at once*
- Scenario: User cannot upgrade all prebuilt rules at once if they have
upgrade conflicts
- Scenario: User can upgrade only conflict-free rules when a mix of
rules with and without conflicts are selected for upgrade
- Scenario: User can upgrade only conflict-free rules when attempting to
upgrade all rules
- Scenario: User can upgrade rule with rule type change individually
- Scenario: User can not bulk upgrade selected rules with rule type
changes
- Scenario: User can not bulk upgrade all rules with rule type changes
- Scenario: API does not upgrade prebuilt rules if they are up to date

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Co-authored-by: Georgii Gorbachev <georgii.gorbachev@elastic.co>
(cherry picked from commit e29033a)