internal/telemetry: disable telemetry on z/OS

[MacMalainey]

disables telemetry on z/OS

z/OS is not going to be supported because:

• It is an unofficial team that maintains this port
• Supporting this feature on z/OS has proven to be difficult (platform issues)
• The z/OS team does not plan on supporting this feature at this time

[gopherbot]

This PR (HEAD: ab72331) has been imported to Gerrit for code review.

Please visit Gerrit at https://go-review.googlesource.com/c/telemetry/+/632695.

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/632695.
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[gopherbot]

Message from Mackenzie Malainey:

Patch Set 1:

(1 comment)

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Please don’t reply on this GitHub thread. Visit golang.org/cl/632695.
After addressing review feedback, remember to publish your drafts!