fix(samples): Removed delays on LRO

[dfirova]

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Fixes #<issue_number_goes_here> ☕️

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[dfirova]

@Neenu1995 , fixed tests, please retrigger Kokoro checks.

[Neenu1995]

@dfirova PTAL

expected to contain:
    Add fulfilment places with current date
but was:
    Create product request: parent: "projects/java-docs-samples-testing/locations/global/catalogs/default_catalog/branches/0"
    product {
.
.
.
	at product.AddFulfillmentPlacesTest.testAddFulfillment(AddFulfillmentPlacesTest.java:67)

[dfirova]

@Neenu1995 , fixed tests, please retrigger Kokoro checks.