chore: update PR template

[slonka]

Update PR template to include warning about things that might break projects that depend on kuma

Signed-off-by: Krzysztof Słonka slonka@users.noreply.github.com

Checklist prior to review

• Link to docs PR or issue -- PR tempalte change, same for everything below
• Link to UI issue or PR --
• Is the issue worked on linked? --
• Unit Tests --
• E2E Tests --
• Manual Universal Tests --
• Manual Kubernetes Tests --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? --

[codecov-commenter]

Codecov Report

Merging #4787 (6eeeec7) into master (4c18e48) will increase coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4787      +/-   ##
==========================================
+ Coverage   46.44%   46.46%   +0.01%     
==========================================
  Files         690      690              
  Lines       47086    47086              
==========================================
+ Hits        21870    21877       +7     
+ Misses      23290    23285       -5     
+ Partials     1926     1924       -2     

Impacted Files	Coverage Δ
pkg/defaults/components.go	53.33% <0.00%> (-3.34%)	⬇️
pkg/xds/generator/direct_access_proxy_generator.go	89.77% <0.00%> (-1.14%)	⬇️
pkg/api-server/server.go	77.68% <0.00%> (+2.89%)	⬆️
pkg/xds/cache/once/once.go	100.00% <0.00%> (+5.00%)	⬆️
pkg/xds/cache/once/cache.go	87.17% <0.00%> (+5.12%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.