fix: Fix issue with dashboard throwing an error when updating the user's password

[nkshah2]

Summary of change

• Fixes an issue where updating a user's password from the dashboard would result in a pointer exception when using the thirdpartyemailpassword recipe (Also applied the fix when updating the user's email)
• Adds tests for userPasswordPut and userPut APIs to verify the fix

Related issues

• Error when updating a user's password from the administration #311

Test Plan

Added new tests

Documentation changes

NA

Checklist for important updates

• Changelog has been updated
• coreDriverInterfaceSupported.json file has been updated (if needed)
  • Along with the associated array in supertokens/constants.go
• frontendDriverInterfaceSupported.json file has been updated (if needed)
• Changes to the version if needed
  • In supertokens/constants.go > version variable
• Had installed and ran the pre-commit hook
• Issue this PR against the latest non released version branch.
  • To know which one it is, run find the latest released tag (git tag) in the format vX.Y.Z, and then find the latest branch (git branch --all) whose X.Y is greater than the latest released tag.
  • If no such branch exists, then create one from the latest released branch.

Remaining TODOs for this PR

• ...