Fix #6276: Type for timeout config options

[pranavmanglik]

When setup_timeout or test_timeout are provided via a configuration
file, they are parsed as strings by default. This causes a TypeError
in aexpect when it attempts to calculate deadlines (float + str).

This explicitly sets key_type=int during option registration to
ensure proper casting.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a critical type mismatch issue where timeout configuration options, when loaded from a file, were being treated as strings instead of integers. By enforcing the correct integer type during option registration, the change prevents runtime errors in deadline calculations, ensuring the stability and reliability of timeout mechanisms within the system.

Highlights

• Type Error Fix: Resolved a TypeError that occurred when setup_timeout or test_timeout were parsed as strings from configuration files, preventing proper deadline calculations.
• Configuration Type Enforcement: Explicitly set key_type=int during the registration of setup_timeout and test_timeout options to ensure they are correctly cast to integers.

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[gemini-code-assist]

Code Review

This pull request adds key_type=int to the setup_timeout and test_timeout option registrations in the remote spawner plugin. This is intended to ensure that when these values are loaded from a configuration file, they are cast to integers, fixing a TypeError. The change is correct and I have no further suggestions.