[Tarako][Email][LMK] Email attachment size limit logic bug results in too-large attachments being attached than detached rather than never detached. Results in email app getting killed. r=mcav. a=1.3T+

Conflicts:
	apps/email/js/cards/compose.js
Merge pull request #19013 from asutherland/v1.3t-email-size-limit-fix

Bug 1006271 - [Tarako][Email][LMK] Email attachment size limit logic bug results in too-large attachments being attached than detached rather than never detached. Results in email app getting killed. r=mcav. a=1.3T+