fix(mongodb-example): Ensure instrumentation is setup before mongoDB client is imported

[NicholasGWK]

Which problem is this PR solving?

• I tried running the example, and wasn't actually getting any db info.
• I ran diag logging, and it said the MongoDB client was being imported before instrumentation was setup
• I reordered the imports, and got db spans!

Short description of the changes

• Reorder imports so tracing setup is first

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: NicholasGWK / name: Nick Kennedy (9c6161e, 1f76c75)
• ✅ login: blumamir / name: Amir Blum (3ab922d)

[codecov]

Codecov Report

Merging #1851 (3ab922d) into main (577a291) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

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  Lines        7425     7425           
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  Hits         6794     6794           
  Misses        631      631