[Chore] Test OpenTelemetry must-gather script

[IshwarKanse]

Description:
The PR adds tests for OpenTelemetry Operator must-gather script, which collects troubleshooting data from the operator and CR instances.

--- PASS: chainsaw (89.11s)
    --- PASS: chainsaw/otlp-metrics-traces (89.11s)
    --- PASS: chainsaw/must-gather (76.85s)
PASS
Tests Summary...
- Passed  tests 2
- Failed  tests 0
- Skipped tests 0
Done.

[IshwarKanse]

cc @iblancasa

[jaronoff97]

i think this makes sense, but i'm wondering if we can try going one step further and checking that we get the expected metrics from the must gather? (i'm working on this in #3381 and would love us to do more of this)

[swiatekm]

LGTM overall, had some relatively minor comments.

[IshwarKanse]

@jaronoff97 The must-gather doesn't expose any metrics. It is used for collecting troubleshooting info from the operator instance like the CR instances, configs, operator logs etc.