fix(util-waiter): fix waiter validation

[smilkuri]

Issue #, if available:
aws/aws-sdk-js-v3#6767

Description of changes:
The waitUntilObjectExists function was incorrectly throwing an error:
Error: WaiterConfiguration.minDelay must be greater than 0
When minDelay was set to 0.5.

Changes Made:
Updated validateWaiterOptions to only throw an error if minDelay, maxDelay, or maxWaitTime are less than or equal to 0 instead of < 1.
Added a test case to verify that small values like 0.01 do not throw an error.
This ensures that fractional values (e.g., 0.5, 0.01) work correctly while keeping 0 invalid.

Testing
for util-waiter:

✓ src/waiter.spec.ts (5)
✓ src/utils/validate.spec.ts (7)
✓ src/poller.spec.ts (5)
✓ src/index.spec.ts (1)
✓ src/createWaiter.spec.ts (3)

Test Files 5 passed (5)
Tests 21 passed (21)
Start at 12:01:40
Duration 223ms (transform 105ms, setup 0ms, collect 212ms, tests 15ms, environment 0ms, prepare 227ms)

If one or more of the packages in the /packages directory has been modified, be sure yarn changeset add has been run and its output has
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[kuhe]

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