This adds a table to show the state of all nomcom positions, and lets the
chair set or un-set multiple state flags at the same time.

As a consequence, it moves the email templates to the "Edit position" form.

This will prevent a session that was changed from "notmeet" to
 being scheduled from having its has_onsite_tool flag left as False

* chore(deps): update all npm dependencies for playwright

* chore(deps): update playwright dependencies

---------

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>
Co-authored-by: NGPixel <[email protected]>

* refactor: Split up get_creation_date to ease testing

* test: Add tests of parse_creation_date()

Note change in expected output when date_elt is None:
instead of returning None, this expects today's date.

* fix: Return today instead of None when date is absent

* fix: Handle empty string for day attribute

* test: Check a couple more parse_creation_date cases

* fix: Revert to returning None when date elt is absent

* style: black

* chore: Remove temporary pin on pydantic

* test: Guarantee ordering of sessions in test

Should fix an intermittent test failure.

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>

* fix: remove GMT offset labels from timezones.js

* fix: add missing continents in timezones.js

* chore(deps): update all Yarn dependencies

* ci: fix yarn cache

---------

Co-authored-by: depfu[bot] <23717796+depfu[bot]@users.noreply.github.com>
Co-authored-by: NGPixel <[email protected]>