fix(auto-ssh): update autossh image and environment variables

[fruch]

Updated autossh container configuration to use version 2.1.0 and adapted environment variables to match new naming convention. Added support for localhost connections via host.docker.internal gateway and configured SSH options for host key checking and authentication.

Testing

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PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)

[fruch]

@dimakr this is an update we needed long ago, and I think it help us to try doing no auth, that we need.

I didn't yet test it with no auth, if it's working as expected

[dimakr]

@dimakr this is an update we needed long ago, and I think it help us to try doing no auth, that we need.

I didn't yet test it with no auth, if it's working as expected

actually we are supporting already streaming logs from scylla cloud node, for some time, for cases with VPC peering (it was working since i added static port for vector.dev..)
We only need to find solution for local dev env.

[fruch]

@dimakr this is an update we needed long ago, and I think it help us to try doing no auth, that we need.
I didn't yet test it with no auth, if it's working as expected

actually we are supporting already streaming logs from scylla cloud node, for some time, for cases with VPC peering (it was working since i added static port for vector.dev..) We only need to find solution for local dev env.

which this PR might hold the key, since with this new image, we can pass down SSH options, and it has a workaround for connecting to the host for the ssh, so it might even work

as for it working with VPC peering, we have proof ? you check it manually ?