[tests-only] Use PHP 7.4 for behat acceptance test dependencies

[phil-davis]

Description

See the issue for details of the problem. Summary: with composer 2.0, behat gets errors when trying to load its dependencies with PHP 7.2 and 7.3. It works OK with PHP 7.4

1. make separate make-file targets for each vendor-bin tool
2. just install the needed vendor-bin tool(s) for each pipeline - this reduces the amount of crud that keeps getting installed
3. lock behat to PHP 7.4 - that is fine because we are happy to run the behat testrunner only on PHP 7.4. There is no need to "test the test runner" on older PHP versions

This works-around the problem. There is likely some dependency of behat that needs to have something sorted out for composer 2.0 and PHP 7.2/7.3. But actually we don't really care about that!

Related Issue

Fixes #38067

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[phil-davis]

core runs some pipelines with S3 storage. That fetches files_primary_s3. And that also has a similar dependency issue.
So this needs owncloud/files_primary_s3#395 merged first.

[phil-davis]

Restarted drone CI. Let's see the result in an hour...

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

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0 Code Smells

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