[internal/otelarrow] Remove manual time.Sleep call

[mx-psi]

Component(s)

internal/otelarrow

Describe the issue you're reporting

#42516 added a manual time.Sleep call to prevent flaky tests resulting from stretchr/testify#1427. We should adapt to the new testify version and remove this.

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[github-actions]

Pinging code owners for internal/otelarrow: @jmacd @moh-osman3. See Adding Labels via Comments if you do not have permissions to add labels yourself. For example, comment '/label priority:p2 -needs-triaged' to set the priority and remove the needs-triaged label.

[github-actions]

Pinging code owners:

• internal/otelarrow: @jmacd @moh-osman3

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[mx-psi]

The PR that fixed this has been reverted at #42812

[github-actions]

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Pinging code owners:

• internal/otelarrow: @jmacd @moh-osman3

See Adding Labels via Comments if you do not have permissions to add labels yourself.