AIP-67 - Multi-team: AwsBatchExecutor per team executor config

[anishgirianish]

---

Summary

Add multi-team support to the AWS Batch Executor,

Changes

• Add supports_multi_team: bool = True flag to AwsBatchExecutor
• Move class-level MAX_SUBMIT_JOB_ATTEMPTS to instance-level max_submit_job_attempts
• Update all conf.get() calls to use self.conf.get() for team-specific configuration
• Change _load_submit_kwargs() from static method to instance method
• Update build_submit_kwargs(conf) to take conf as required parameter
• Add test_team_config test to verify team isolation works

---

• Read the Pull Request Guidelines for more information. Note: commit author/co-author name and email in commits become permanently public when merged.
• For fundamental code changes, an Airflow Improvement Proposal (AIP) is needed.
• When adding dependency, check compliance with the ASF 3rd Party License Policy.
• For significant user-facing changes create newsfragment: {pr_number}.significant.rst or {issue_number}.significant.rst, in airflow-core/newsfragments.