Update username validation on useradd

[sainak]

This pull request updates the username validation on the useradd feature. The changes include:

• Updating the regular expression pattern for username validation to allow usernames with 4-16 characters.

• Adding additional validation rules to ensure that usernames only contain lowercase letters, digits, and . _ - characters.

• Ensuring that usernames start and end with a letter or number.

• Preventing consecutive special characters . _ - in usernames.

fixes #7115
related but not dependent on ohcnetwork/care#1865

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[cypress]

Passing run #2072 ↗︎

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Details:

Update username validation on useradd
Project: CARE	Commit: c5475c493e
Status: Passed	Duration: 02:40 💡
Started: Feb 12, 2024 3:52 AM	Ended: Feb 12, 2024 3:54 AM

Review all test suite changes for PR #7134 ↗︎

[github-actions]

Hi, This pr has been automatically marked as stale because it has not had any recent activity. It will be automatically closed if no further activity occurs for 7 more days. Thank you for your contributions.

[github-actions]

👋 Hi, @sainak,
Conflicts have been detected against the base branch. Please rebase your branch against the base branch.

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This message is automatically generated by prince-chrismc/label-merge-conflicts-action so don't hesitate to report issues/improvements there.

[nihal467]

LGTM

[github-actions]

@sainak We truly appreciate your efforts. Thank you for taking the time to contribute; this is a very valuable contribution to us 🥇. We always welcome your contribution 🙂, so feel free to contribute to anything anytime, and never lose that spirit of innovation 🙌.