chore(ci): Only run examples CI on examples changes or version bump (#6082)
### Description
We currently run examples on all code changes, which is not necessary
since examples run on the released turbo, not the current code. This PR
changes the CI to only run when the examples code is changed, when CI
changes, or when a new version of turborepo is released.
### Testing Instructions
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Closes TURBO-1396
Co-authored-by: nicholaslyang <Nicholas Yang>