CDRIVER-5497 implement downstream RPM spec check

[rcsanchez97]

This change implements a check whereby if the RPM spec file we are shipping in the C driver repository differs from the downstream RPM spec file (e.g., because downstream has updated and we have not yet synced it to obtain that update), then the rpm-package-build task will fail. This is implemented so that it will only run on waterfall builds (so that patch builds are not unnecessarily cluttered by a most likely unrelated failure of this task).

Patch build: https://spruce.mongodb.com/task/mongo_c_driver_packaging_rpm_package_build_patch_bef6e2d37436fd465f165d7062af9fe2262d6738_65e76bd77742aeab743dd2c9_24_03_05_19_00_42/logs?execution=0

[2024/03/05 14:02:04.386] Running command 'shell.exec' (step 1 of 4).
[2024/03/05 14:02:04.391] This is a patch build...skipping RPM spec check
[2024/03/05 14:02:04.391] Finished command 'shell.exec' (step 1 of 4) in 4.205077ms.

Simulated waterfall build (failure): https://spruce.mongodb.com/task/mongo_c_driver_packaging_rpm_package_build_patch_bef6e2d37436fd465f165d7062af9fe2262d6738_65e76a571e2d17ab5ad0ee45_24_03_05_18_54_19/logs?execution=0

[2024/03/05 13:58:53.494] Running command 'shell.exec' (step 1 of 4).
[2024/03/05 13:58:53.688] Files .evergreen/etc/mongo-c-driver.spec and /data/mci/770212188af98933ef70bdd5e63e2642/tmp/mongo-c-driver.sQAlkiZ7.spec differ
[2024/03/05 13:58:53.690] Synchronize RPM spec from downstream to fix this failure.
[2024/03/05 13:58:53.690] Command 'shell.exec' (step 1 of 4) failed: shell script encountered problem: exit code 1.

Simulated waterfall build (success, produces no output): https://spruce.mongodb.com/task/mongo_c_driver_packaging_rpm_package_build_patch_bef6e2d37436fd465f165d7062af9fe2262d6738_65e76a2ae3c331b0aa3b7297_24_03_05_18_53_34/logs?execution=0

[2024/03/05 13:57:01.710] Running command 'shell.exec' (step 1 of 4).
[2024/03/05 13:57:01.900] Finished command 'shell.exec' (step 1 of 4) in 189.687348ms.

I will also cherry-pick this to r1.26 after merging.