[management] Add IDP timeout env variable

[ressys1978]

Describe your changes

Introduced the NETBIRD_IDP_TIMEOUT environment variable to the management service. This allows configuring a timeout for supported IDPs. If the variable is unset or contains an invalid value, a default timeout of 10 seconds is used as a fallback.

This is needed for larger IDP environments where 10s is just not enough time.

Issue ticket number and link

This should fix #1386

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)

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Documentation

Select exactly one:

• I added/updated documentation for this change
• Documentation is not needed for this change (explain why)

I don't feel this needs to be documented at this time, as currently the number of self-hosted netbird users with larger IDP environments is probably very small.

Docs PR URL (required if "docs added" is checked)

Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

Quality Gate failed

Failed conditions
80.2% Duplication on New Code (required ≤ 5%)

See analysis details on SonarQube Cloud

[ressys1978]

Closed as I see what the issue is.