Remove vestigal object_store/.circleci/

[alamb]

Which issue does this PR close?

re

Rationale for this change

While running the release scripts they flagged this file as non license compatible

Running rat license checker on /Users/alamb/Software/arrow-rs/dev/dist/apache-arrow-rs-20.0.0-rc1/apache-arrow-rs-20.0.0.tar.gz
NOT APPROVED: object_store/.circleci/config.yml (apache-arrow-rs-20.0.0/object_store/.circleci/config.yml): false
       1 unapproved licences. Check rat report: rat.txt

This file is no longer used since the migration of object_store to arrow-rs.

It is probably a good think to figure out if we can remove object_store from the archive entirely 🤔

What changes are included in this PR?

Delete file #2172

Are there any user-facing changes?

no

[ursabot]

Benchmark runs are scheduled for baseline = 9fde389 and contender = 83fab37. 83fab37 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java