[profiles] Improve DAP name length error

[khewonc]

What does this PR do?

If a profile name is too long, older versions of the operator would run into an error attempting to label the node, leading to this error:

{"level":"ERROR","ts":"2024-05-15T21:05:59Z","msg":"Reconciler error","controller":"datadogagent","controllerGroup":"datadoghq.com","controllerKind":"DatadogAgent","datadogAgent":{"name":"datadog","namespace":"default"},"namespace":"default","name":"datadog","reconcileID":"aaeaa6dd-0e90-41fd-9094-e0b7931919a5","error":"Node \"kind-worker\" is invalid: metadata.labels: Invalid value: \"default-abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz\": must be no more than 63 characters"}

It can be unexpected that the operator would complain about node labels when applying a profile. Instead, we now invalidate the profile and output an error message that clarifies that the profile name is the issue.

{"level":"ERROR","ts":"2024-06-27T17:20:12Z","logger":"controllers.DatadogAgent","msg":"datadogagentprofile","datadogagent":{"name":"datadog","namespace":"default"},"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz":"datadogagentprofile_namespace","error":"Profile name must be no more than 63 characters"}
{"level":"ERROR","ts":"2024-06-27T17:20:12Z","logger":"controllers.DatadogAgent","msg":"profile cannot be applied","datadogagent":{"name":"datadog","namespace":"default"},"datadogagentprofile":"abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz","datadogagentprofile_namespace":"default","error":"Profile name must be no more than 63 characters"}

Motivation

https://datadoghq.atlassian.net/browse/CECO-1187

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: n/a
• Cluster Agent: n/a

Describe your test plan

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Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.01%. Comparing base (a3ce2ae) to head (89732b2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1254      +/-   ##
==========================================
+ Coverage   54.98%   55.01%   +0.02%     
==========================================
  Files         243      243              
  Lines       27986    28002      +16     
==========================================
+ Hits        15388    15404      +16     
  Misses      11729    11729              
  Partials      869      869              

Flag	Coverage Δ
unittests	55.01% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
pkg/agentprofile/agent_profile.go	63.17% <100.00%> (+2.43%)	⬆️

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