Add a manual task to run tests against specific branches

Yury Matveevrequested to merge
606-add-an-option-to-run-tests-agaings-specific-braches-set-test-main-cpptango-to-always-test into develop

Closes #606 (closed)

To add option to use specific branch, I propose to add pure manual job "test-source-against-develop-dependencies" with 3 variables:

IDL_SOURCE: "main"
CPPTANGO_SOURCE: "main"
TANGOTEST_SOURCE: "main"
PYTHON_VERSION: "3.12"

By default, jobs will run against heads of all repos, but we can always re-define to particular branch

Edited by Yury Matveev

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