…er OTel spec

Description

The BatchLogRecordProcessor._DEFAULT_SCHEDULE_DELAY_MILLIS was set to
5000ms, but the OTel specification defines OTEL_BLRP_SCHEDULE_DELAY
default as 1000ms.

Fixes #4991

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Updated existing unit tests in opentelemetry-sdk/tests/logs/test_export.py
to reflect the corrected default value of 1000ms instead of 5000ms.

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• [ x ] No.

Checklist:

• [ x ] Followed the style guidelines of this project
• [ x ] Changelogs have been updated
• [ x ] Unit tests have been added
• [ x ] Documentation has been updated