Added copy connection action

[VBhojawala]

Added copy connection action which attaches __suffix to duplicated connection.

Closes : #12401

[mik-laj]

Can you add tests to avoid regression?

[VBhojawala]

Added test case to check copy connection with and without prefix with multi select.

[jhtimmins]

Is it fair to treat all aws_mongo variants as essentially interchangeable in terms of numbering them? Would aws_mongo__1__1 make more sense than aws_mongo__3 to make clear that it's a copy of aws_mongo__1? It doesn't look as nice, but it seems like people would copy aws_mongo__1 because they want a copy of that exact variant.

[VBhojawala]

Here in test case i have used '__1' as existing connection to test copy connection which were already copied connection and not renamed after copy.

For Pattern matching in RegEx we have used '__/d+$' to differentiate system(airflow) assigned suffix (we have used same Regex for Task and TaskGroup decorators). User can use single underscore '_' or '-' to assign number to connection name which will make it start from 1.

For Example

'mongo_1' -> 'mongo_1__1'
'mongo-1' -> 'mongo-1__1'

[VBhojawala]

Re-based PR.

[github-actions]

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