[JENKINS-35206] - Make the InstallState object deserialization robust against corrupted files (#2387)

* [JENKINS-35206] - Add unit tests for the deserialization logic

* [JENKINS-35206] - Install state should be robust against messed statuses when deserializing objects

* [JENKINS-35206] - Fix the license header in thre test file

(cherry picked from commit 1b2711c9)

(cherry picked from commit 54164110)

* [JENKINS-35178] Fix close button in Safari

* [JENKINS-35178] Removed units

* [JENKINS-35178] Back to the original button design

(cherry picked from commit d35c7de7)

(cherry picked from commit 53f89740)

* [FIXED JENKINS-34881] - handle non-default security settings for new installs

* Ensure permissions

* Initial security authentication token should still follow redirects

(cherry picked from commit 723dfca3)

This reverts commit 673e8b5e.

* JENKINS-35198 Add failing test for clear identification of the issue and future regression test

* JENKINS-35198 Fix DelegatingComputerLauncher logic for filtering out subclasses as possible delegates

this logic is by default, and subclasses can still allow the selection of other DelegatingComputerLauncher instances as delegates.

Updated Polish translations

Fixes Jenkins build error

contains fixes for GROOVY-7761 and GROOVY-7826

[FIXES JENKINS-34751]

* [JENKINS-35020] Fixed some JSHint errors

* [JENKINS-35020] @kzantow's comment was addressed

* [JENKINS-35020] @kzantow's comment was addressed

[FIXED JENKINS-34883] the legacy default update site can be different from the one specified by ID_DEFAULT

* JENKINS-34708 - UpdateCenter.EnableJob not properly setting status

* Restore if (status instanceof Pending)

* [JENKINS-31417] CLI command connect-node extracted from core to CLI

connect-node extended to accept multiple node names
connect-node covered by test-cases

* Slighty modified Javadoc

* Fixed translations after rebase

* [JENKINS-34531] Extended CLI online-node for accepting multiple agents

Polished and extended related TC as well.

* Simplified string composition

* Simplified initialization of HashSet

[FIXED JENKINS-34880] do not show warnings if tool installer is present in at least 1 update site (#2361)

* [JENKINS-34854] - Migrate missing Integer and Boolean properties to SystemProperties

* [JENKINS-34854] - API methods for Long variables

* [JENKINS-34854] - Migrate Long settings to SystemProperties

* [JENKINS-34854] - Leftover change (I should use Save All)

* [JENKINS-34854] - Some fixes in Long methods Javadoc and log messages

* [JENKINS-34244] Some UX improvements in the New item form
* [JENKINS-34244] Submit button has three-state behavior
* [JENKINS-34244] New helper methods were added to make easier the form validation. Focus behavior reviewed

* Handle legacy use of iconSize as a variable

When iconSize was set as a jelly variable, not passed as an attribute,
the value was not being normalized to an IconSizeClass. Fixes
JENKINS-25220.

* Evaluate attrs.iconSize explicitly.

[JENKINS-33663] - Upgrade wizard