[collectd/statsd] Remove deprecated plugin

[atoulme]

Description:
Remove deprecated collectd/statsd plugin.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.14%. Comparing base (6e453cb) to head (ee4c12f).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7085      +/-   ##
==========================================
+ Coverage   38.10%   38.14%   +0.03%     
==========================================
  Files         358      357       -1     
  Lines       25107    25099       -8     
==========================================
+ Hits         9568     9573       +5     
+ Misses      14746    14734      -12     
+ Partials      793      792       -1     

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[pjanotti]

Changes themselves LGTM, I didn't look at the test failure: just re-kicked the test.

[atoulme]

Test fails with:

2026-01-22T02:38:20.528Z	INFO	testutils/collector_container.go:270	2026-01-22T02:38:20.527Z	info	collectd/logging.go:40	qemu-aarch64: Could not open '/bin/ld-linux.so': No such file or directory	{"resource": {"service.instance.id": "1b45b46e-bd64-4528-83d2-68228866e3ec", "service.name": "otelcol", "service.version": "v0.143.0-21-g65974102"}, "otelcol.component.id": "smartagent/collectd_apache", "otelcol.component.kind": "receiver", "otelcol.signal": "metrics", "name": "default", "collectdInstance": "global"}
2026-01-22T02:38:20.528Z	INFO	testutils/collector_container.go:270	2026-01-22T02:38:20.527Z	error	collectd/collectd.go:317	Collectd died when it was supposed to be running, restarting...	{"resource": {"service.instance.id": "1b45b46e-bd64-4528-83d2-68228866e3ec", "service.name": "otelcol", "service.version": "v0.143.0-21-g65974102"}, "otelcol.component.id": "smartagent/collectd_apache", "otelcol.component.kind": "receiver", "otelcol.signal": "metrics", "name": "default", "collectdInstance": "global"}

I guess this file was brought over by a dependency from the agent bundle?