Cache temporary redirections in the original location (#4459)

[kysmith-csg]

Some p2 sites can temporarily redirect to another location. In the case of JFrog Artifactory, these redirection URLs are too long to make as a file path, so the build would fail in this case. For temporary redirects, we save the artifact in the original location instead, since it's likely the redirection might change in the future. Permanent redirects will get their own cache entry as before.

[github-actions]

Test Results

  603 files  ±0    603 suites  ±0   4h 16m 38s ⏱️ + 9m 10s
  432 tests ±0    420 ✅  - 4   7 💤 ±0  1 ❌ ±0  4 🔥 +4 
1 296 runs  ±0  1 266 ✅  - 7  22 💤 ±0  1 ❌ ±0  7 🔥 +7 

For more details on these failures and errors, see this check.

Results for commit df64a9b. ± Comparison against base commit edb9113.

[kysmith-csg]

Text not found in log: No repository found at http://localhost:49744/repoB
org.apache.maven.it.VerificationException: Text not found in log: No repository found at http://localhost:49744/repoB
	at org.apache.maven.it.Verifier.verifyTextInLog(Verifier.java:351)
	at org.eclipse.tycho.test.tycho2938.ContentJarTest.redirectToBadLocation(ContentJarTest.java:89)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)

We get various other errors, but not this one :(

Running locally I get these three:

1. Failed to load p2 metadata repository from location http://localhost:57700/repoB
2. Unable to read repository at http://localhost:57700/repoB
3. http://localhost:57700/repoB is not a valid repository location