DRIVERS-3002 Use mongodl.py in download-mongodb.sh

[blink1073]

Remove hard-coded links in favor of using mongodl.py for server and crypt shared downloads.

Tested with pymongo, including with crypt_shared: https://spruce.mongodb.com/version/67104a54b4458200075b17f7/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

Tested with c driver: https://spruce.mongodb.com/version/67104aafac605b00072f28b2/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC

[ShaneHarvey]

Are these failures expected?

[2024/10/16 17:03:29.536] GIT_TRACE=1 git clone [https://x-access-token:<REDACTED:EVERGREEN_GENERATED_GITHUB_TOKEN>@github.com/mongodb-labs/drivers-evergreen-tools.git](https://x-access-token:%3CREDACTED%3AEVERGREEN_GENERATED_GITHUB_TOKEN%[email protected]/mongodb-labs/drivers-evergreen-tools.git) 'src' --branch 'master'
[2024/10/16 17:03:29.829] [branch='master' clone_method='access-token' message='cloning failed' num_attempts='5' operation='git.get_project' owner='mongodb-labs' repo='drivers-evergreen-tools']: problem running fetch command: after 5 attempts, operation failed: attempt 5: waiting on process 'fb67cdbe-7303-4864-8fee-cc40f1c98dc7': exit status 128

[blink1073]

Those seem to have been transient errors on Evergreen, I kicked the affected tests.

[ShaneHarvey]

LGTM

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