Add error message when notification size > 256KB

[whabanks]

Summary | Résumé

This PR adds a front end error message, with guidance, when attempting to send a one off notification that exceeds the SQS size limit of 256KB.

Related work

• Check that notifications don't exceed SQS message limit notification-api#2085

Test instructions | Instructions pour tester la modification

Pull and run the above API PR when testing locally. From the UI there are only a couple scenarios where a notification can reach the 256KB limit by using variables in one-offs. This is because:

• The email content and subject fields have character limit validation.
• Files can only be attached when using the API.
• Our RecipientCSV class has built in validation on column values and overall content length that prevent users from reaching the 256KB limit when performing bulk sends.

Test 1

1. Create an email template using template_content.txt
2. Send using that template with this content for the variable var1_content.txt
3. Note the error message that guides you to the largest variable in your message

Test 2

1. Edit your template, adding two more variables
2. Chunk the above var1_content.txt into 3 and insert them into the newly added variables, keeping track of which variable holds the largest chunk
3. Attempt the send again and note that the largest variable is specified in the error message

[github-actions]

🧪 Review environment

https://dkuxq7efuvcbzj6fp5zgf3ikxi0wnzlg.lambda-url.ca-central-1.on.aws/

[amazingphilippe]

Suggested change

	"Your message exceeds the size limit of 256KB","FR: Your messages exceeds the size limit of 256KB"
	"{} holds the most content. You may be able to send your message if you reduce or remove that content.","FR: {} holds the most content. You may be able to send your message if you reduce or remove that content."
	"Your message exceeds the size limit of 256KB","Votre message dépasse la limite de taille de 256 Ko"
	"{} holds the most content. You may be able to send your message if you reduce or remove that content.","{} contient le plus de contenu. Vous pourriez être en mesure d’envoyer votre message si vous réduisez ou supprimez ce contenu."