Update which Collector meeting times are pinned to the Pacific Time zone

[evan-bradley]

This is a follow up to #2249.

After this PR, the Collector has three meeting times:

• 09:00 PT, which is 12:00 ET, 18:00 CET, and 00:00 or 01:00 UTC+8 depending on DST. This meeting is primarily US-centric, but also sees frequent attendance from European Collector leads and community members.
• 17:00 PT, which is 20:00 ET, 02:00 CET, and 08:00 or 09:00 UTC+8 depending on DST. This meeting is intended for meeting between those in PT and UTC+8, as it is outside normal working hours for those in ET and CET.
• 20:00 UTC+8, which is 08:00 ET, 14:00 CET, and 05:00 PT during DST. This meeting is primarily intended to be Europe-friendly, but also sees frequent attendance from Collector leads and community members in ET.

Since the 20:00 UTC+8 time is outside of normal APAC working hours and is intended for those in ET and CET, I would like to propose that we pin it to PT. PT has daylight savings time and will make the time stable for those in ET and CET, outside any brief differences in when DST is in effect.

cc @open-telemetry/collector-triagers @open-telemetry/collector-contrib-triagers

[svrnm]

@evan-bradley, thanks for clarification. Can you provide a PR to revert the change I applied, I can also do it, just let me know

[evan-bradley]

Appreciate you taking a look, I opened a PR with the way I think we should define the times.