Clear examples cache during major upgrades

[guineveresaenger]

Update: Apologies for the delay here; see pulumi/pulumi-terraform-bridge#2323.

pulumi/pulumi-confluentcloud#559 failed because the upgrade process was using an old examples cache locally.
As a result, the Go SDK was generated with old version paths in the examples code, which failed the Clean Worktree check.
The upgrade-provider tool should remove the cache to ensure we're generating examples correctly.

[t0yv0]

Suggest fixing in the bridge instead since some interaction happens via make tfgen instead of via upgrade-provider, that'd be more definitive.

[guineveresaenger]

@t0yv0 - reasonable! I see you found pulumi/pulumi-terraform-bridge#2323 already.

[danielrbradley]

Seems reasonable for a short-term fix, if we can't land a fix to the cache key in the next couple of weeks

[iwahbe]

I'd much rather prioritize adding the major version to the cache in the bridge then fix it here. Unless this problem comes up regularly, I would suggest just fixing the bridge.

If you do need to merge, please add a TODO linking the step to the bridge bug.

[t0yv0]

I'm with Daniel, ship the workaround. We'll fix the root cause later.