[Refactor]: Deprecate support for BitBucket App Passwords

[malhotra5]

What problem or use case are you trying to solve?

BitBucket is deprecating their support for app passwords in place for api tokens.

We need to rework our BitBucket integration that heavily relies on username:password schema.

Describe the UX or technical implementation you have in mind

Additional context
BitBucket blog post announcing app password deprecation

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