fix(credentials): ensure deletion occurs within transaction context

[andrewazores]

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---

Fixes: #753

Description of the change:

Ensures transaction context is active when processing credential deletions in particular situations.

Motivation for the change:

This change is helpful because users may want to...

How to manually test:

1. Check out PR
2. Apply this patch:

diff --git a/src/main/java/io/cryostat/discovery/Discovery.java b/src/main/java/io/cryostat/discovery/Discovery.java
index 508dbd55..0279cc46 100644
--- a/src/main/java/io/cryostat/discovery/Discovery.java
+++ b/src/main/java/io/cryostat/discovery/Discovery.java
@@ -215,6 +215,9 @@ public class Discovery {
                             remoteURI));
         }
 
+        if (true) {
+            throw new BadRequestException();
+        }
         if (agentTlsRequired && !callbackUri.getScheme().equals("https")) {
             throw new BadRequestException(
                     String.format(

3. Build PR
4. ./smoketest.bash -O -t quarkus-cryostat-agent
5. Because of the patch above, the Agent instance should fail to register itself with Cryostat. Check Cryostat's logs when this happens. Before this PR, exceptions like in [Bug] Credential deletion happens outside of a transaction context #753 will be seen. With this PR the logs should be clean when the Agent instance fails to register and tries to clean up its own credentials.
6. Alternatively, simply open the web UI and go to Security, then define a credential. Then try to delete it, and check the Cryostat logs immediately after. The same kind of stack trace should appear if this PR is not applied. Requires fix(storedcredentials): define target match array to avoid undefined reference error cryostat-web#1513

[andrewazores]

/build_test

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CI build and push: All tests pass ✅
https://github.com/cryostatio/cryostat/actions/runs/12470186351