[ISSUE-7880] Change Password Screen and Backend Code

[yeebenja]

• Add completed Backend tsx file for ISSUE-7880.
• Add completed screen for Changing Password.

[mm-cloud-bot]

@yeebenja: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

I understand the commands that are listed here

[mattermost-build]

Hello @yeebenja,

Thanks for your pull request! A Core Committer will review your pull request soon. For code contributions, you can learn more about the review process here.

Per the Mattermost Contribution Guide, we need to add you to the list of approved contributors for the Mattermost project.

Please help complete the Mattermost contribution license agreement?
Once you have signed the CLA, please comment with /check-cla and confirm that the CLA check is green.

This is a standard procedure for many open source projects.

Please let us know if you have any questions.

We are very happy to have you join our growing community! If you're not yet a member, please consider joining our Contributors community channel to meet other contributors and discuss new opportunities with the core team.

[enahum]

This is wrong and makes no real change to the user password, changing the password should be by calling the appropriate API and this is not needed

[enahum]

How do we get to this screen?

[mattermost-build]

This PR has been automatically labelled "stale" because it hasn't had recent activity.
A core team member will check in on the status of the PR to help with questions.
Thank you for your contribution!