refactor: introduce julep_common env + exceptions

[creatorrr]

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Summary

• share init_env and compute_gunicorn_workers in new julep_common package
• add JulepError and TooManyRequestsError exceptions
• use shared utilities in agents-api and integrations service
• copy shared package in Docker builds
• update docker-bake and compose files

Testing

• ruff check
• ruff format

[qodo-merge-for-open-source[bot]]

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(Feedback updated until commit https://github.com/julep-ai/julep/commit/9c605d898ceb418a2ff2f0a226d3daa2b46ac7ed)

A test triggered by this PR failed. Here is an AI-generated analysis of the failure:

Action: Test

Failed stage: Set up python and install dependencies [❌]

Failure summary: The action failed during the Python package installation process in the agents-api directory. The specific error occurred when trying to generate package metadata for agents-api==1.0.0. The failure was caused by a relative path issue with the dependency julep-common. The error message indicates that the system couldn't resolve the relative path ../julep_common specified in the dependencies.

Relevant error logs: 1: ##[group]Operating System 2: Ubuntu ... 965: prune-cache: true 966: ignore-nothing-to-cache: false 967: ##[endgroup] 968: Downloading uv from "https://github.com/astral-sh/uv/releases/download/0.7.5/uv-x86_64-unknown-linux-gnu.tar.gz" ... 969: [command]/usr/bin/tar xz --warning=no-unknown-keyword --overwrite -C /home/runner/work/_temp/a5037535-6208-4cb9-9e2b-bc6820da862a -f /home/runner/work/_temp/05a3c2b5-37f0-4c3f-812b-2bb75621c438 970: Added /opt/hostedtoolcache/uv/0.7.5/x86_64 to the path 971: Added /home/runner/.local/bin to the path 972: Set UV_CACHE_DIR to /home/runner/work/_temp/setup-uv-cache 973: Successfully installed uv version 0.7.5 974: Searching files using cache dependency glob: **/uv.lock 975: /home/runner/work/julep/julep/agents-api/uv.lock 976: /home/runner/work/julep/julep/cli/uv.lock 977: /home/runner/work/julep/julep/integrations-service/uv.lock 978: Found 3 files to hash. 979: Trying to restore uv cache from GitHub Actions cache with key: setup-uv-1-x86_64-unknown-linux-gnu-0.7.5-d92603d25acef1c08e643c37cc2475e5e190deb9690356b084828d60043a591f 980: ##[warning]Failed to restore: Cache service responded with 422 981: No GitHub Actions cache found for key: setup-uv-1-x86_64-unknown-linux-gnu-0.7.5-d92603d25acef1c08e643c37cc2475e5e190deb9690356b084828d60043a591f ... 1009: Binaries available at /opt/hostedtoolcache/golang-migrate/migrate/latest/linux-x64 1010: ##[group]Run cd agents-api 1011: [36;1mcd agents-api[0m 1012: [36;1muv python install[0m 1013: [36;1muv sync --all-extras --dev[0m 1014: shell: /usr/bin/bash -e {0} 1015: env: 1016: UV_CACHE_DIR: /home/runner/work/_temp/setup-uv-cache 1017: ##[endgroup] 1018: Downloading cpython-3.12.10-linux-x86_64-gnu (download) (20.3MiB) 1019: Downloading cpython-3.12.10-linux-x86_64-gnu (download) 1020: Installed Python 3.12.10 in 1.14s 1021: + cpython-3.12.10-linux-x86_64-gnu 1022: Using CPython 3.12.10 1023: Creating virtual environment at: .venv 1024: error: Failed to generate package metadata for `agents-api==1.0.0 @ virtual+.` 1025: Caused by: Failed to parse metadata from built wheel 1026: Caused by: relative path without a working directory: ../julep_common 1027: julep-common@ file://../julep_common 1028: ^^^^^^^^^^^^^^^^^^^^^^ 1029: ##[error]Process completed with exit code 2. 1030: Post job cleanup.