feat: support MongoDB 8.0.23

[weicao]

Summary

• add MongoDB 8.0.23 as a supported non-deprecated ComponentVersion release
• add exact 8.0.23 BackupPolicyTemplate image mappings for dump/shard PSM tooling while keeping 8.0 fallback on 8.0.17
• update README serviceVersion examples

Validation

• helm lint addons/mongodb
• helm template mongodb addons/mongodb | rg -n "name: 8\.0\.23|serviceVersion: 8\.0\.23|percona-server-mongodb:8\.0\.23|mappedValue: \"8\.0\.23\""

Image mirror note

Before this PR, docker.io/apecloud/percona-server-mongodb:8.0.23 and apecloud-registry.cn-zhangjiakou.cr.aliyuncs.com/apecloud/percona-server-mongodb:8.0.23 were missing, while upstream docker.io/percona/percona-server-mongodb:8.0.23 existed. Triggered apecloud-cd workflow run: https://github.com/apecloud/apecloud-cd/actions/runs/26714217662

Runtime validation must still use an approved target/vcluster with serviceVersion=8.0.23; this PR only covers chart/render support.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (3a15d39) to head (49ecdf7).

Additional details and impacted files

@@                           Coverage Diff                           @@
##           amber/mongodb-config-template-ownership   #2708   +/-   ##
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  Coverage                                     0.00%   0.00%           
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  Lines                                         9197    9197           
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  Misses                                        9197    9197           

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