[ANE-591] deprecates --json to favor --format json for fossa test and fossa container test

[meghfossa]

Overview

This PR;

• deprecates --json to favor --format json for fossa test and fossa container test

Acceptance criteria

Don't break existing users, but display warnings:

• when user uses fossa test --json a warning is displayed AND JSON output if rendered
• when user uses fossa container test --json a warning is displayed AND JSON output if rendered

New method works:

• when user uses fossa test --format json, JSON output if rendered.
• when user uses fossa container test --format json, JSON output if rendered.

Testing plan

fossa test

# Setup
git checkout feat/deprecate-fossa-test-json
make install-local
mkdir sandbox && echo 'black' > sandbox/reqs.txt
./fossa analyze sandbox --project  ane591 --revision 0

# Act

## No regression
./fossa test --project  ane591 --revision 0

## new fmt works
./fossa test --project  ane591 --revision 0 --format json

## warning is rendered
## same output as `fossa test --project  ane591 --revision 0 --format json`
./fossa test --project  ane591 --revision 0 --json

fossa container test

# Setup
git checkout feat/deprecate-fossa-test-json
make install-local
./fossa container analyze redis:alpine --project  ane591container --revision 0

# Act

## No regression
./fossa container test --project  ane591container --revision 0

## new fmt works
./fossa container test --project  ane591container --revision 0 --format json

## warning is rendered
## same output as `fossa test --project  ane591container --revision 0 --format json`
./fossa container test --project  ane591container --revision 0 --json

Risks

Low risk

References

https://fossa.atlassian.net/browse/ANE-591

Checklist

• I added tests for this PR's change (or explained in the PR description why tests don't make sense).
• If this PR introduced a user-visible change, I added documentation into docs/.
• If this change is externally visible, I updated Changelog.md. If this PR did not mark a release, I added my changes into an # Unreleased section at the top.
• If I made changes to .fossa.yml or fossa-deps.{json.yml}, I updated docs/references/files/*.schema.json. You may also need to update these if you have added/removed new dependency type (e.g. pip) or analysis target type (e.g. poetry).

[spatten]

LGTM!