Simplify name of generated exception mappers

[geoand]

• Closes: Rest: shorten the names of the generated classes #43786

[quarkus-bot]

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It should be safe to merge provided you have a look at the other checks in the summary.

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Flaky tests - Develocity

⚙️ JVM Tests - JDK 17

📦 extensions/panache/hibernate-reactive-rest-data-panache/deployment

✖ io.quarkus.hibernate.reactive.rest.data.panache.deployment.repository.PanacheRepositoryResourcePutMethodTest.shouldUpdateComplexObject - History

• 1 expectation failed. JSON path name doesn't match. Expected: is "updated collection" Actual: empty collection - java.lang.AssertionError

java.lang.AssertionError: 
1 expectation failed.
JSON path name doesn't match.
Expected: is "updated collection"
  Actual: empty collection

	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)

[FroMage]

Why not replace $ExceptionMapper$ with the method name?

[geoand]

I find that looking at this name I know for sure that is a generated exception mapper without having to look into the code itself

[FroMage]

Indeed you know what it is, but you don't know where it's defined, so you can't find it back easily.

[FroMage]

Whereas if you can find it back, then it's pretty obvious what it is once you look at it.

[geoand]

I say let's roll with the change as is and we can always come back if we find it confusing in practice