Cleanup Spurious Setup Failures in Mail Tests

[brideck]

Both of these tests throw setup failures doing things that aren't necessary for their respective tests. These failures don't actually cause any failures, but can serve as one heck of a red herring.

ex.

08-21-2025 00:49:24:  SVR-ERROR: Exception : test1 not found
08-21-2025 00:49:24:  SVR-ERROR: Setup Failed!
08-21-2025 00:49:24:  SVR-ERROR: jakarta.mail.FolderNotFoundException: test1 not found
	at org.eclipse.angus.mail.imap.IMAPFolder.checkExists(IMAPFolder.java:448)
	at org.eclipse.angus.mail.imap.IMAPFolder.open(IMAPFolder.java:1061)
	at org.eclipse.angus.mail.imap.IMAPFolder.open(IMAPFolder.java:994)
	at com.sun.ts.tests.javamail.ee.internetMimeMultipart.internetMimeMultipart_Test.setup(internetMimeMultipart_Test.java:106)
    ...

This PR removes the unnecessary steps from each test, eliminating the ugly error.

CC @alwin-joseph @anajosep @arjantijms @cesarhernandezgt @dblevins @m0mus @edbratt @gurunrao @jansupol @jgallimore @kazumura @kwsutter @LanceAndersen @bhatpmk @RohitKumarJain @shighbar @gthoman @brideck @OndroMih @dmatej
@starksm64 @scottmarlow