Run tests against v1.27 and update the docs compatibility matrix

[adejanovski]

What this PR does:
Updates the support matrix in the docs and upgrades the tests to use k8s v1.26

Which issue(s) this PR fixes:
Fixes #1155

Checklist

• Changes manually tested
• Automated Tests added/updated
• Documentation added/updated
• CHANGELOG.md updated (not required for documentation PRs)
• CLA Signed: DataStax CLA

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b39cc4d) 56.83% compared to head (6b372af) 56.80%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
- Coverage   56.83%   56.80%   -0.04%     
==========================================
  Files         100      100              
  Lines       10352    10352              
==========================================
- Hits         5884     5880       -4     
- Misses       3950     3953       +3     
- Partials      518      519       +1     

see 1 file with indirect coverage changes

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud