fix: the telemetry namesapce should match the operator's one

[TomerFi]

This PR resolves a bug where the telemetry ConfigMap was not found because the system was incorrectly looking for it in the toolhive-system Namespace. The current implementation assumes a fixed namespace, which is not always correct. This led to the following error:

{"level":"error","ts":1758653623.3299508,"caller":"telemetry/telemetry.go:231","msg":"Failed initial telemetry check","error":"failed to save telemetry data: namespaces \"toolhive-system\" not found","stacktrace":"github.com/stacklok/toolhive/pkg/operator/telemetry.(*Service).StartTelemetryWorker\n\tgithub.com/stacklok/toolhive/pkg/operator/telemetry/telemetry.go:231\ngithub.com/stacklok/toolhive/pkg/operator/telemetry.(*LeaderTelemetryRunnable).Start.func1\n\tgithub.com/stacklok/toolhive/pkg/operator/telemetry/telemetry.go:58"}

To test the suggested fix, I built and deployed an intermediate image in a namespace other than toolhive-system. The successful log records indicate that the system was able to find the ConfigMap and complete the update check:

{"level":"info","ts":1758654932.597325,"caller":"telemetry/telemetry.go:115","msg":"Checking for updates..."}
...
{"level":"info","ts":1758654932.7073739,"caller":"telemetry/telemetry.go:133","msg":"Update check completed","currentVersion":"build-ec51391a","latestVersion":"v0.3.5"}

[JAORMX]

@TomerFi seems the helm chart test is failing, you might wanna check that out. Also, you probably wanna rebase.

[TomerFi]

@JAORMX ^^

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.54%. Comparing base (42c2d6f) to head (78b0e68).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/thv-operator/main.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2003      +/-   ##
==========================================
+ Coverage   47.52%   47.54%   +0.02%     
==========================================
  Files         232      232              
  Lines       28890    28892       +2     
==========================================
+ Hits        13729    13736       +7     
+ Misses      14132    14129       -3     
+ Partials     1029     1027       -2     

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[TomerFi]

@JAORMX ^^