Reworks SSH Tunneling For SQL Databases

[nickzelei]

This PR reworks SSH Tunneling for SQL Databases.

We previously were starting a TCP server and proxying the network connections between it by exposing a host port and giving that to the database drivers.

We are no longer doing that in favor of creating driver-specific database connectors that now are providing with a custom DialFunc which, upon invocation, first connects to the configured jump box via the SSH Client. The dial is then passed to that connection to dial the actual database.

This is much cleaner because now we can just provide the database connection directly to sql.Open and all of the dialing complexities are handled behind the scenes by the system libs themselves. Nice!

This rework allows for much better tests and error propagation. Nice Nice!

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[codecov]

Codecov Report

Attention: Patch coverage is 35.86006% with 220 lines in your changes missing coverage. Please review.

Project coverage is 36.65%. Comparing base (939c88e) to head (4e017c3).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/pkg/sqlconnect/sql-connector.go	32.50%	104 Missing and 4 partials ⚠️
internal/sshtunnel/dialer.go	0.00%	45 Missing ⚠️
...ackend/pkg/sqlmanager/postgres/postgres-manager.go	55.88%	13 Missing and 2 partials ⚠️
...1alpha1/connection-data-service/connection-data.go	0.00%	14 Missing ⚠️
backend/pkg/sqlmanager/sql-manager.go	0.00%	11 Missing ⚠️
...n-tunnel-manager/providers/sqlprovider/provider.go	41.66%	5 Missing and 2 partials ⚠️
...shtunnel/connectors/mysqltunconnector/connector.go	76.19%	3 Missing and 2 partials ⚠️
...unnel/connectors/postgrestunconnector/connector.go	71.42%	3 Missing and 1 partial ⚠️
backend/pkg/mongoconnect/connector.go	0.00%	3 Missing ⚠️
...rker/internal/connection-tunnel-manager/manager.go	77.77%	2 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2708      +/-   ##
==========================================
- Coverage   36.99%   36.65%   -0.35%     
==========================================
  Files         286      286              
  Lines       26957    26568     -389     
==========================================
- Hits         9973     9738     -235     
+ Misses      15672    15524     -148     
+ Partials     1312     1306       -6     

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