[Console] Implement start/stop for RFS backfill on ECS

[mikaylathompson]

Description

This PR implements start and stop for an RFS backfill running on ECS, by setting the desired count of the ECS service to either the scale number in services.yaml (default is 1 if not provided) or to 0 (for stop).

I created an ECSService class that handles the actual communication with ECS and will be reused to implement the same thing for the replayer.

Tested manually in an AWS deployment.

Issues Resolved

MIGRATIONS-1789

Testing

Manually in an AWS deployment & via unit tests.

⚠️ We don't currently have an E2E tests that use RFS.

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
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[codecov]

Codecov Report

Attention: Patch coverage is 66.10169% with 20 lines in your changes missing coverage. Please review.

Project coverage is 64.95%. Comparing base (8e4c8a7) to head (729049e).
Report is 55 commits behind head on main.

Files	Patch %	Lines
...le/lib/console_link/console_link/logic/backfill.py	0.00%	12 Missing ⚠️
...rationConsole/lib/console_link/console_link/cli.py	16.66%	5 Missing ⚠️
...console_link/console_link/models/command_result.py	25.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #740      +/-   ##
============================================
+ Coverage     64.85%   64.95%   +0.09%     
- Complexity     1588     1591       +3     
============================================
  Files           238      239       +1     
  Lines          9879     9918      +39     
  Branches        771      771              
============================================
+ Hits           6407     6442      +35     
- Misses         3064     3068       +4     
  Partials        408      408              

Flag	Coverage Δ
gradle-test	?
python-test	?
unittests	64.08% <ø> (?)

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