chore: Add pre and post release documentation

[AObuchow]

What does this PR do?

Adds additional documentation for the pre and post release procedures for DevWorkspace Operator.

What issues does this PR fix or reference?

n/a, documentation improvement

Is it tested? How?

n/a

PR Checklist

• E2E tests pass (when PR is ready, comment /test v8-devworkspace-operator-e2e, v8-che-happy-path to trigger)
  • v8-devworkspace-operator-e2e: DevWorkspace e2e test
  • v8-che-happy-path: Happy path for verification integration with Che

[AObuchow]

@dkwon17 @ibuziuk let me know if the additional release documentation added in this PR is clear when you both have a moment. Thank you :)

[AObuchow]

Failing CI check is unrelated to this PR but something I will have to look into and resolve.

[dkwon17]

LGTM 👍

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AObuchow, dkwon17

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• OWNERS [AObuchow,dkwon17]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8f3eafb) 52.48% compared to head (0b3c1fa) 52.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1231      +/-   ##
==========================================
+ Coverage   52.48%   52.52%   +0.03%     
==========================================
  Files          84       84              
  Lines        7636     7636              
==========================================
+ Hits         4008     4011       +3     
+ Misses       3335     3333       -2     
+ Partials      293      292       -1     

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