[Metrics] Improve ManualSendMessage

[rlinoz]

Objective

We want to improve the Send a Message performance metric.

Target: 300ms

You can check the current values and monitor progress at:
https://expensify.sentry.io/dashboard/166325/?statsPeriod=14d

[rlinoz]

Waiting for someone to pick this up.

[melvin-bot]

@rlinoz Uh oh! This issue is overdue by 2 days. Don't forget to update your issues!

[melvin-bot]

@rlinoz 6 days overdue. This is scarier than being forced to listen to Vogon poetry!

[rlinoz]

Will probably only be picked up next year.

[melvin-bot]

@rlinoz Uh oh! This issue is overdue by 2 days. Don't forget to update your issues!

[rlinoz]

Waiting to be picked up.