fix(saml): correct handling of remove

[adlerhurst]

fixes the following panic:

runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x1 addr=0x8 pc=0xf79054]
at github.com/zitadel/zitadel/internal/command.removeAppIDFromEntityIDs ( [/home/runner/work/zitadel/zitadel/internal/command/project_application_saml_model.go:261](https://console.cloud.google.com/debug?referrer=fromlog&file=%2Fhome%2Frunner%2Fwork%2Fzitadel%2Fzitadel%2Finternal%2Fcommand%2Fproject_application_saml_model.go&line=261&project=zitadel-domains) )

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[codecov]

Codecov Report

Merging #5606 (82a0e88) into main (991a563) will increase coverage by 0.00%.
The diff coverage is 93.10%.

@@           Coverage Diff           @@
##             main    #5606   +/-   ##
=======================================
  Coverage   48.42%   48.42%           
=======================================
  Files         693      693           
  Lines       72237    72239    +2     
=======================================
+ Hits        34981    34984    +3     
+ Misses      35620    35619    -1     
  Partials     1636     1636           

Impacted Files	Coverage Δ
internal/command/project_application_saml_model.go	61.79% <0.00%> (+0.34%)	⬆️
internal/eventstore/repository/sql/crdb.go	62.01% <100.00%> (ø)
...nal/eventstore/v1/internal/repository/sql/query.go	87.19% <100.00%> (+0.07%)	⬆️
internal/query/projection/idp_login_policy_link.go	58.68% <100.00%> (+0.39%)	⬆️

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[github-actions]

🎉 This PR is included in version 2.24.0-ignore-me2.1 🎉

The release is available on GitHub release

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