chore: Remove Che opertor memory limit workaround

[mmorhun]

What does this PR do?

Reverts memory limit workaround for huge clusters in Che Operator.
Updates note on some fields, that require a new label.

Screenshot/screencast of this PR

N/A

What issues does this PR fix or reference?

eclipse-che/che#20647

How to test this PR?

The same way as #1166

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• Custom resource definition file is up to date
• OLM bundles are up to date
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[tolusha]

Pls use `` instead of ''. It simplifies way how description converted into docs

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mmorhun, tolusha

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[openshift-ci]

@mmorhun: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v8-multi-host-next-deployment	113ba46	link	true	/test v8-multi-host-next-deployment

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