Add mass action to invalidate indexes via admin

[fredden]

Description (*)

This pull request adds the ability for an administrator to mark indexes as invalid via the admin. The indexes will then be run by the normal minutely cron.

Fixed Issues (if relevant)

I am not aware of any open issues regarding this change.

Manual testing scenarios (*)

1. Browse to admin -> System -> Tools -> Index Management
2. Select index tickbox
3. Use mass-action drop-down to select 'invalidate index'
4. Click 'submit'
5. Observe index is now marked as invalid

Questions or comments

I have used the existing permission "Change indexer mode", but can move this to its own permission category if desired.

I copied the 'masschangelog' controller & test to make this action.

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds are green)

[m2-assistant]

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[ihor-sviziev]

Now changes looks good, please fix tests issues

[engcom-Alfa]

✔️ QA Passed

[engcom-Golf]

@magento run all tests

[slavvka]

The failure of Sanity check is a known issue. https://jira.corp.magento.com/browse/MTS-852

[m2-assistant]

Hi @fredden, thank you for your contribution!
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