[FLINK-38860] Remove flink shaded guava usage

[gyfora]

What is the purpose of the change

The kubernetes operator uses flink shaded classes, this can be very problematic if the operator api is used as a library from other apps to submit resources. We should follow the standard best prectice of not using flink shaded classes outside core flink.

Brief change log

• Remove shaded guava usage and replace with regular guava
• Update checkstyle
• Update Notice file

Verifying this change

Unit test and test in prod envs

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): yes
• The public API, i.e., is any changes to the CustomResourceDescriptors: no
• Core observer or reconciler logic that is regularly executed: yes

Documentation

• Does this pull request introduce a new feature? no

[mxm]

Should this regex be a bit more general to guard against new shaded guava releases?

Suggested change

	<property name="illegalPkgs" value="org.apache.flink.shaded.guava31"/>
	<property name="illegalPkgs" value="org.apache.flink.shaded.guava.*"/>

[gyfora]

I tried different alternatives: shaded.guava, shaded.guava*, shaded.guava.* non of them actually worked unfortunately, so I have given up

[mxm]

This should work:

Suggested change

	<property name="illegalPkgs" value="org.apache.flink.shaded.guava31"/>
	<property name="illegalPkgs" regexp="true" value="org.apache.flink.shaded.guava.*"/>

Note that regex feature needs to be enabled. See https://checkstyle.sourceforge.io/checks/imports/illegalimport.html#Properties

[gyfora]

ah, nice! thank you

[gaborgsomogyi]

  Error:                          {"type":"org.apache.flink.kubernetes.operator.exception.DeploymentFailedException","message":"[artifacts-fetcher] toomanyrequests: You have reached your unauthenticated pull rate limit. https://www.docker.com/increase-rate-limit","additionalMetadata":{"reason":"ErrImagePull"},"throwableList":[]}

[gaborgsomogyi]

The change looks good