build(webpack): Build `integration-docs` on "watchRun" (#15230)
build(webpack): Build `integration-docs` on "watchRun" (#15230)

Previously only built before webpack runs, but this did not include the "watch" mode. Include hook for `watchRun` so that it checks on first build in "watch" mode for integration-docs.
beeftornado/sentry,beeftornado/sentry,beeftornado/sentry