Fix APM HostPort configuration

[clamoriniere]

What does this PR do?

When APM enable, configure automaticaly the TCP port as a HostPort.

Fixes: #312

Motivation

Allow the usage of APM in applicative pod with the TCP communication.

Additional Notes

N/A

Describe your test plan

Deploy the the agent with

apiVersion: datadoghq.com/v1alpha1
kind: DatadogAgent
#...
spec:
  #...
  agent:
    # ...
    apm:
      enabled: true

the port 8126 on the trace-agent container should be created with the hostPort option.

[codecov-commenter]

Codecov Report

Merging #338 (9c8146d) into main (ba84e08) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #338      +/-   ##
==========================================
+ Coverage   63.58%   63.90%   +0.31%     
==========================================
  Files          61       61              
  Lines        6704     6705       +1     
==========================================
+ Hits         4263     4285      +22     
+ Misses       2134     2113      -21     
  Partials      307      307              

Flag	Coverage Δ
unittests	63.90% <100.00%> (+0.31%)	⬆️

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

Impacted Files	Coverage Δ
controllers/datadogagent/utils.go	83.60% <100.00%> (+0.01%)	⬆️
api/v1alpha1/datadogagent_default.go	83.24% <0.00%> (+3.86%)	⬆️

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