[Release] Release 0.7.0

[romilbhardwaj]

• [x] pytest tests/test_smoke.py --aws
• [x] pytest tests/test_smoke.py --gcp except test_tpu_vm and test_tpu_vm_pod #4236
• [x] pytest tests/test_smoke.py --azure (had to switch to different account for CPU quotas required for test_azure_best_tier_failover)
• [x] pytest tests/test_smoke.py --kubernetes
• [x] locally build docs, open docs/build/index.html, scroll over “CLI Reference” (ideally, every page) to see if there are missing sections (we once caught the CLI page completely missing due to an import error; and once it has weird blockquotes displayed)
• [x] Check sky -v
• [x] backward_compatibility_tests.sh run against 0.6.0 on gcp
• [x] Run manual stress tests (see subsection below)
  • [x] following script

    sky jobs launch --gpus A100:8 --cloud aws echo hi -y
    # Check we are properly failing over the zones:
    sky jobs logs --controller

  • [x] following script

    sky launch -c dbg --cloud aws --num-nodes 16 --gpus T4 --down --use-spot 
    sky down dbg

  • [x] sky launch --num-nodes=75 -c dbg --cpus 2+ --use-spot --down --cloud gcp -y
  • [x] sky launch --num-nodes=75 -c dbg --cpus 2+ --use-spot --down --cloud aws -y
• [x] sky show-gpus manual tests

[romilbhardwaj]

Note: bf17e87d2f7887ee7d741a298a7094d6d25656cb (#4239) has been cherry picked onto this release.

[romilbhardwaj]

Testing complete. This PR is ready to be merged.

Note that github messes up the PR diff when commits are cherry picked. Here's the real diff for this PR: https://github.com/skypilot-org/skypilot/compare/releases/0.7.0..0.7.0_rc