Add skip feature to mailcow admin password reset script

[HichemAK]

Added option to skip confirmation for resetting the mailcow admin account.

Contribution Guidelines

• I've read the contribution guidelines and wholeheartedly agree them

What does this PR include?

Short Description

I simply gave the possibility to skip confirmation in helper-scripts/mailcow-reset-admin.sh using a -y or --yes flag. This is useful for automation.

Affected Containers

No container is affected

Did you run tests?

What did you tested?

I tested the script both and without the flag I introduced.

Without flag

root@XXX:/opt/mailcow-dockerized# ./helper-scripts/mailcow-reset-admin.sh
Checking MySQL service... OK
Are you sure you want to reset the mailcow administrator account? [y/N] y

Working, please wait...

Reset credentials:
---
Username: admin
Password: 4awgpEghlxVis9xa
TFA: none

With either -y or --yes flag

root@XXX:/opt/mailcow-dockerized# ./helper-scripts/mailcow-reset-admin.sh -y
Checking MySQL service... OK

Working, please wait...

Reset credentials:
---
Username: admin
Password: _RlQ3Qh5i0VY-kAF
TFA: none

What were the final results? (Awaited, got)

The script works as expected with or without the flag.