Add missing selenium function (backport #13493) (backport #13501)

[mergify]

Proposed Changes

Add. missing javascript function to selenium. And add a bash function that allows to initialize an idp without starting it.

Types of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply

• [] Bug fix (non-breaking change which fixes issue #NNNN)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause an observable behavior change in existing systems)
• Documentation improvements (corrections, new content, etc)
• Cosmetic change (whitespace, formatting, etc)
• Build system and/or CI

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This is an automatic backport of pull request #13493 done by [Mergify](https://mergify.com).

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This is an automatic backport of pull request #13501 done by [Mergify](https://mergify.com).