x/telemetry/config: add counters for VulncheckMode options usage

[ethanalee-work]

Summary

Targeting gopls@v0.21.0, we are adding telemetry to collect usage metrics for the VulncheckMode option. These counters are necessary to understand VulncheckMode options usage and inform future decisions regarding tool support.

gopls/setting/vulncheck:{Off,Imports} - user VulncheckMode usage

Proposed Config Change

https://go-review.googlesource.com/c/telemetry/+/707895

[gopherbot]

Change https://go.dev/cl/707895 mentions this issue: internal/chartconfig: update config to add VulncheckMode options counter

[ethanalee-work]

CC @findleyr

[gabyhelp]

Related Issues

• x/telemetry/config: add counters for Vulncheck Codelens Usage #75546
• x/telemetry/config: add govulncheck counters #67678 (closed)
• x/telemetry/config: add counters for MCP server tool usage #75450
• x/tools/gopls: record telemetry for which settings are used #71285 (closed)

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[findleyr]

SGTM. Let's give the community a week to chime in (not that I expect this to be controversial).

[findleyr]

Approved in 1w unless someone objects.

[ethanalee-work]

When the new VulncheckModePrompt is introduced, then we will need to update this.