Add nightly dependency bump workflow

[ezhang6811]

Issue #, if available:

Description of changes: Add a workflow nightly-build.yml with following actions:

• creates or checks out existing nightly-dependency-updates branch
• checks for newest versions of dependencies in opentelemetry-java-instrumentation and opentelemetry-java-contrib, bumps versions if applicable, and creates/updates PR
• search for releases with breaking changes in release notes, and links in the PR
• runs main build checks on the branch, publishes a failure metric based on the outcome.

Example nightly build PR: https://github.com/aws-observability/aws-otel-js-instrumentation/pull/273

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.