Feature/nrmi 39 self serve user name update

[reemi1510]

Description

• NRMI-39: self-service update user name

Why was the change made?

• Improved user experience
• Reduced supplier user queries into RMI support

Are there any dependencies required for this change?

None

What type of change is it?

Please delete options that are not relevant.

[X] New feature

How was the change tested?

Unit and manual testing

[ccs-snyk]

✅ Snyk checks have passed. No issues have been found so far.

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