[Scenes] Increase YAML CI timers

[lpbeliveau-silabs]

Some of the transition check timers are tight for the scenes yaml tests.
To avoid some unwanted failures in CI, we should bump them all to at least 250ms higher than their transition times.
Example:
Move to level with transition time of 1s -> CI should wait 1.25s to ensure the move to level is complete before checking again.

[lpbeliveau-silabs]

Aims to prevent issues like the one mentionned in this PR: #29910

[lpbeliveau-silabs]

#29910 Actually adjusted the only timer that was too tight, others were already increased enough.