Add v0.40.0 changelog

[akurinnoy]

Assisted-by: Claude Sonnet 4.6

What does this PR do?

Adds changelog for the 0.40.0 upstream release.

[ibuziuk]

LGTM, cross-linked with Eclipse Che 7.115.0 RNs, assuming that the changelog will be available under https://github.com/devfile/devworkspace-operator/blob/0.40.x/CHANGELOG.md once merged

[rohanKanojia]

@akurinnoy : You would need to amend commit with --signed-off-by: footer. I'm assuming this was committed using claude that's why DCO check is complaining.

[akurinnoy]

@rohanKanojia you're right. I'm waiting for the suggestions to apply them, and then I'll squash and sign the commit.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: akurinnoy, Allda, ibuziuk, rohanKanojia, tolusha
Once this PR has been reviewed and has the lgtm label, please assign dkwon17 for approval. For more information see the Code Review Process.

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.91%. Comparing base (b3e2af5) to head (d0b17d0).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1597      +/-   ##
==========================================
+ Coverage   35.48%   35.91%   +0.43%     
==========================================
  Files         168      168              
  Lines       14484    14513      +29     
==========================================
+ Hits         5139     5212      +73     
+ Misses       9006     8957      -49     
- Partials      339      344       +5     

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