… unique translation names (Nyholm)

This PR was submitted for the master branch but it was merged into the 3.2 branch instead (closes #21271).

Discussion
----------

[Workflow] Added new validator to make sure each place has unique translation names

| Q             | A
| ------------- | ---
| Branch?       | 3.2
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets |
| License       | MIT
| Doc PR        | n/a

A definition where a place that has transitions with the same name is an invalid definition.

```yaml
invalid1:
  places: ['a', 'b', 'c']
  transitions:
    t1:
      from: a
      to: b
    t1:
      from: a
      to: c

valid1:
  places: ['a', 'b', 'c']
  transitions:
    t1:
      from: a
      to: b
    t2:
      from: a
      to: c

valid2:
  places: ['a', 'b', 'c']
  transitions:
    t1:
      from: a
      to: b
    t1:
      from: b
      to: c

valid3:
  places: ['a', 'b', 'c', 'd']
  transitions:
    t1:
      from: ['a', 'b']
      to: d
    t2:
      from: ['a', 'b']
      to: c
```

FYI @lyrixx

Commits
-------

eece8ad [Workflow] Added new validator to make sure each place has unique translation names