test(client-s3): disable checksum calculation and validation in legacy tests

[trivikr]

Issue

Missed in #6750

Description

Disables checksum calculation and validation in legacy tests

Testing

Before

$ ./node_modules/.bin/cucumber-js --fail-fast -t "@s3"
This Node.js version (v22.11.0) has not been tested with this version of Cucumber; it should work normally, but please raise an issue if you see anything unexpected.
.........................................................................F--.-------------------------------------------------------------------------------------------------------------------------------------------------------

Failures:

1) Scenario: Operating on a bucket using path style # features/s3/buckets.feature:56
   ✔ Before # features/extra/hooks.js:15
   ✔ Before # features/s3/step_definitions/buckets.js:3
   ✔ Before # features/s3/step_definitions/hooks.js:3
   ✔ Before # features/s3/step_definitions/proxy.js:5
   ✔ Given I force path style requests # features/s3/step_definitions/buckets.js:235
   ✔ And I create a bucket # features/extra/hooks.js:38
   ✔ When I put "abc" to the key "hello" in the bucket # features/s3/step_definitions/buckets.js:254
   ✔ And I get the key "hello" in the bucket # features/s3/step_definitions/buckets.js:263
   ✖ Then the bucket name should be in the request path # features/s3/step_definitions/buckets.js:242
       TypeError: Cannot read properties of undefined (reading 'path')
           at Object.<anonymous> (/local/home/trivikr/workspace/aws-sdk-js-v3/features/s3/step_definitions/buckets.js:243:35)
   - And the bucket name should not be in the request host # features/s3/step_definitions/buckets.js:248
   - Then I delete the object "hello" from the bucket # features/s3/step_definitions/buckets.js:271
   ✔ After # features/s3/step_definitions/buckets.js:8

23 scenarios (1 failed, 15 skipped, 7 passed)
128 steps (1 failed, 93 skipped, 34 passed)
0m07.069s (executing steps: 0m06.990s)

After

$ ./node_modules/.bin/cucumber-js --fail-fast -t "@s3"
...
23 scenarios (23 passed)
128 steps (128 passed)
0m09.966s (executing steps: 0m09.409s)

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