[PropertyAccess] Add objectives to pluralMap
merged branch franmomu/add_objective_to_plurals (PR #7594)

This PR was merged into the 2.2 branch.

Discussion
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[PropertyAccess] Add objectives to pluralMap

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7483
| License       | MIT
| Doc PR        |

Commits
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6ef92fd [PropertyAccess] Add objectives to pluralMap