refactor(integration-tests): use container test agent

[eliottness]

What

This PR replaces all the code installing and managing the ddapm-test-agent process in favor of a testcontainer.

Why

Benefits:

• Being able to run the testsuite as root more easily because python packages as root are broken
• The latest docker image is built with the last commit on main which contains feat: meta_struct support dd-apm-test-agent#184 and remove the need for this kind of trick like here b74fc7b
• No need to install python in the workflows

[eliottness]

Docker is not available on windows and macos runners

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 29 lines in your changes missing coverage. Please review.

Project coverage is 67.31%. Comparing base (981f2c7) to head (6532dd8).

Files	Patch %	Lines
_integration-tests/utils/agent/agent.go	0.00%	29 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #248      +/-   ##
==========================================
+ Coverage   62.57%   67.31%   +4.73%     
==========================================
  Files         101       99       -2     
  Lines        5259     4347     -912     
==========================================
- Hits         3291     2926     -365     
+ Misses       1627     1079     -548     
- Partials      341      342       +1     

Components	Coverage Δ
Instruments	34.56% <ø> (ø)
Go Driver	67.24% <ø> (+4.32%)	⬆️
Toolexec Driver	69.24% <ø> (+3.40%)	⬆️
Aspects	78.05% <ø> (+8.08%)	⬆️
Injector	77.87% <ø> (+6.22%)	⬆️

Files	Coverage Δ
_integration-tests/utils/agent/agent.go	0.00% <0.00%> (ø)

... and 80 files with indirect coverage changes