fix: missing field in datasources for entitlements

[lechnerc77]

Purpose

• Adds the field category to the data sources for entitlements
• Closes [BUG] Missing field "category" in datasources for entitlements #328

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Test the code via automated test

go test ./...

What to Check

Verify that the following are valid:

Other Information

• Connected to changes mage in PR fix: polling for directories and entitlements #318
• No test re-recording needed as single fields are not evaluated

Checklist for reviewer

The following organizational tasks must be completed before merging this PR:

• The PR is assigned to the Terraform project and a status is set (typically "in review").
• The PR has the matching labels assigned to it.
• The PR has a milestone assigned to it.
• If the PR closes an issue, the issue is referenced.
• Possible follow-up items are created and linked.

[rui1610]

lgtm