fix(clusters): use working S3 URL format for CloudFormation role template link

[Guimove]

Summary

• The AWS "Cloudformation stack" quick-launch link in the cluster credentials modal used the legacy path-style S3 URL (https://s3.amazonaws.com/cloudformation-qovery-role-creation/template.json).
• That URL returns a 301 with no Location header for this bucket (it lives in us-east-2, and the legacy global path-style endpoint is really only well-behaved for us-east-1 buckets). Switched to the virtual-hosted-style URL (https://cloudformation-qovery-role-creation.s3.amazonaws.com/template.json), matching the format already used in our docs, which resolves directly with a 200 OK.

Note: this was initially raised as a possible fix for a customer (Semble) Access Denied report on Quick Create Stack, but we've since confirmed the customer's error is unrelated to this URL format (they got the same result on both URL variants) - it's most likely caused by an SCP or IAM restriction on their AWS account, still under investigation. This PR stands on its own as a minor robustness fix, not a resolution to that customer issue.

Test plan

• Verified the old URL returns 301 with no Location header via curl
• Verified the new URL returns 200 OK via curl
• Manually click "Cloudformation stack" link in the cluster credentials modal and confirm the AWS Quick Create Stack page loads the template without error

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 47.60%. Comparing base (d1900fd) to head (7dc24f7).
⚠️ Report is 1 commits behind head on staging.

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #2807      +/-   ##
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+ Coverage    46.93%   47.60%   +0.66%     
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  Files         1252      783     -469     
  Lines        26778    19628    -7150     
  Branches      7804     5956    -1848     
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- Hits         12569     9343    -3226     
+ Misses       12052     8636    -3416     
+ Partials      2157     1649     -508     

Flag	Coverage Δ
unittests	47.60% <ø> (+0.66%)	⬆️

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