pjsip: Add tests for Advanced Codec Negotiation (ACN)

[maximilianfridrich]

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[asterisk-org-access-app]

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[maximilianfridrich]

cherry-pick-to: none

[maximilianfridrich]

This PR must use the corresponding asterisk PR which implements the codec negotiation:

• core,app_dial,pjsip: Implement Advanced Codec Negotiation (ACN) asterisk#285

In this PR, 10 existing tests were adopted to reflect the new behavior. For those tests, pjsip.conf had to be adopted to use the new ACN settings. The default settings prefer the pending stream while these tests expect the configured settings to be preferred.

[github-actions]

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