tools/examples: remove v1_to_bootstrap and v1 example configs

[derekargueta]

Description: v1_to_boostrap.cc is a utility that, as named, converts v1 configurations into a v2 configuration. The v1 API support has been removed since 1.8 so I think it's safe to remove this tool. I've also removed the example google v1 configurations, as at this point they may just cause confusion rather than aid newcomers. Since it's not part of the runtime and given the long deprecation period, I think deletion is fine.
Risk Level: none - proxy code is untouched
Testing: n/a
Docs Changes: updated to remove mention of v1_to_bootstrap tool
Release Notes: n/a

Signed-off-by: Derek Argueta dereka@pinterest.com

[derekargueta]

coverage output:

WARNING: Running Bazel server needs to be killed, because the startup options are different.
WARNING: Waiting for server process to terminate (waited 5 seconds, waiting at most 60)
WARNING: Waiting for server process to terminate (waited 10 seconds, waiting at most 60)
WARNING: Waiting for server process to terminate (waited 30 seconds, waiting at most 60)
INFO: Waited 60 seconds for server process (pid=82) to terminate.
WARNING: Waiting for server process to terminate (waited 5 seconds, waiting at most 10)
WARNING: Waiting for server process to terminate (waited 10 seconds, waiting at most 10)
INFO: Waited 10 seconds for server process (pid=82) to terminate.
FATAL: Attempted to kill stale server process (pid=82) using SIGKILL, but it did not die in a timely fashion.

[moderation]

Thanks for this PR. When I updated the docs and configs previously in #6025 and #6368 I studiously avoided the v1 to v2 stuff. Good to remove it.

[mattklein123]

Sweet!