[bugfix] CA: replacement of LOG(fatal) with std::runtime_error throwing; proper definition of the ca-parameters output name in CbmL1

The merge request fixes the bug reported in the Redmine issue 3213.

Modifications:

• setting the output directory name for the CA parameters file as ".", if it was not provided
• replacement of LOG(fatal) with throwing the std::runtime_error exception in the cbm::algo::ca::InitManager.

Edit PAL: for auto-referencing, Redmine Refs #3213

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Dear @d.smith, @fweig, @se.gorbunov, @s.zharko,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

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