Test in CI whether the provider can compile on a 32-bit system

4.78.0 was delayed due to an issue introduced in https://github.com/GoogleCloudPlatform/magic-modules/pull/8517: a validation used an integer upper bound that was invalid on 32-bit systems. This was not caught until release time because our CI runs all use 64 bits. We should attempt to compile TPG / TPGB for 32-bit systems in PR CI runs to catch this kind of issue earlier in the future.