Fix RIA store operations from Mac clients

[mih]

Aiming to resolve datalad/datalad#7536

This work requires datalad v1.0.1 or later!

Log:

• sshd docker image did not have Git, which is required for create-sibling-ria. Added in datalad/datalad-ci-docker-containers@bae2501
• sadly, the particular client/server combination needed for testing Publishing to ria store  datalad#7536 is unavailable. There is no docker on appveyor's mac hosts, hence the SSH testing runs against localhost.
• outcome of the baseline (pre-patch) testing on windows-clients likely reproduces a stalling of ora-remote initialization observed in the office hour on Apr 16 https://ci.appveyor.com/project/mih/datalad-next/builds/49631743/job/wq2x96ojg19d1gb5
• adopted and deployed patch from Make ORA remote more aware of the remote OS when using SSH datalad#7549 by @mslw
• imported datalad-ria patches for SSH command execution that likely fix a range of underlying issues, see
  • Patch scp argument-building in BaseSSHConnection datalad-ria#91
  • Change the "endmarker" logic of the SSHRemoteIO shell  datalad-ria#90
  • Patch to enable SSH-based remote command executor for windows clients datalad-ria#73
• these patches (alone) do not cut it. I found that using the code from Add PersistentSubShell-feature #596 to replace the Popen call in SSHRemoteIO.__init__ leads to a usable authentication prompt, on windows, with no stdin connected to the terminal. I guess that is the path forward. Wait for Add PersistentSubShell-feature #596 to land and then patch RIA/ORA to use it.
• disabled the RIA test on windows again. Waiting for Add PersistentSubShell-feature #596

[codecov]

Codecov Report

Attention: Patch coverage is 60.95890% with 57 lines in your changes are missing coverage. Please review.

Project coverage is 92.70%. Comparing base (c8ad167) to head (dc779fa).

Files	Patch %	Lines
datalad_next/patches/ora_remote.py	22.22%	21 Missing ⚠️
datalad_next/patches/sshremoteio.py	76.66%	8 Missing and 6 partials ⚠️
datalad_next/patches/sshconnector.py	40.00%	12 Missing ⚠️
datalad_next/patches/tests/test_ria.py	72.72%	6 Missing ⚠️
datalad_next/patches/ssh_exec.py	75.00%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #653      +/-   ##
==========================================
- Coverage   93.07%   92.70%   -0.38%     
==========================================
  Files         171      176       +5     
  Lines       11973    12141     +168     
  Branches     1806     1825      +19     
==========================================
+ Hits        11144    11255     +111     
- Misses        642      690      +48     
- Partials      187      196       +9     

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[mih]

I will merge this now. The SSHRemoteIO related patches will like receive a further consolidation based on the work coming in from #596 and #655