Fix various "incompatible" messages for plugin manager

[JENKINS-61466] Ignore war/work and war/target on frontend tests

[JENKINS-61478] Style improvements to alert banners

* [JENKINS-61479] Fix a bug in FingerprintCleanupThread and add tests.

* Upgraded Hamcrest to Version 2.2. Incorporated Hamcrest assertion for FingerprintCleanupThread tests.

* Blank line removed

* Changed timestamp_millis->Date; Removed unused imports

* Added hamcrest version as a property

* Changed to assert log output

* [JENKINS-61467] Do not show disabled, implied permissions in erors

* Maintain order of permissions, fix test assertion

Hyperlinks in label-related CauseOfBlockage.print

[JENKINS-61694] - Update Groovy Init hooks to run after all job configurations are adapted

* [JENKINS-5597] don't follow symlinks

add an option that allows to configure the DirectoryScanner used by
ArtifactArchiver to not follow symbolic links. Option is enabled by
default for backwards compatibility.

* missing readresolve

need to resolve in case it is not defined

* add linebreaks at end of file

* add test for not follow symlinks

* fix indentation

* add tests

update ant to 1.10.7 which supports symlinks on windows and is able to
properly ignore them

* change default in jelly to false

* fix test execution

* indentation and help text

* [JENKINS-61453] Using MANAGE instead of ADMINISTER

* Remove TODO comment
Co-Authored-By: NDaniel Beck <1831569+daniel-beck@users.noreply.github.com>

* [JENKINS-61453] build queue cancel button is also MANAGE
Co-authored-by: NTim Jacomb <timjacomb1+github@gmail.com>
Co-authored-by: NDaniel Beck <1831569+daniel-beck@users.noreply.github.com>

* Update the page footer content and styles

- Restyle to increase font size a bit and improve the hyperlink styles

* Remove the "Page Generated" info from the footer

* Open the version link in another tab

* Update core/src/main/resources/lib/layout/layout.jelly

* Remove arrow icons from footer hyperlinks and version letter

* Improves footer styles to account for the insertion point contributions

* Remove unused svg sprite

* Restores the page timestamp on the page footer
Co-authored-by: NTim Jacomb <t.jacomb@kainos.com>

Use a jenkins Changelog Generator App in the release drafting flow

Copied the colors from the "info" alert in bootstrap for the default

Apart from background color, including text color and border color. Also, removing opacity.

Support null Secrets when converting form submissions

* Delete ConfidentialStoreRule

* Also delete MockSecretRule so Secret.fromString works

* Secret.SECRET still referenced by SecretHelper in jenkins-test-harness, used by RekeySecretAdminMonitorTest, also copied in publish-over-*-plugin

* RSAConfidentialKey ought to use the same SecureRandom as the ConfidentialStore; this also lets the mock use a fixed seed

* For now ConfidentialStore.secureRandom can be abstract

* Some core unit tests can be rather verbose; set maven.test.redirectTestOutputToFile

* Looks like we need a ConfidentialStoreRule after all

* Restored another couple of usages

IntelliJ/Java: Duplicate code -- Refactored as AntClassLoader.storeAndConvert(...Convert<T>)

[JENKINS-56643] Util.createSymlink: prefer Files.move(..., ATOMIC_MOVE)

[JENKINS-61692] Fix proxy form validation

Static nested classes

Update .NET version checks to be more correct when Windows services when installing master and agent on platforms with modern .NET versions

[JENKINS-61688] Load build discarder configuration after restart