Allow long max seq length by default

[tjohnson31415]

Set VLLM_ALLOW_LONG_MAX_MODEL_LEN=1 in the UBI docker build to have it enabled by default. This allows the operator to specify a --max-model-len that exceeds the value parsed from the model's config.json. A warning will still be printed, but the server will not crash.

See: vllm-project#7080

[tjohnson31415]

Tests failed due to a requirements file missing from the docker build mounts... unrelated to the change in this PR:

ERROR: Could not open requirements file: [Errno 2] No such file or directory: 'requirements-adag.txt'
error: build error: building at STEP "RUN --mount=type=cache,target=/root/.cache/pip --mount=type=bind,source=requirements-common.txt,target=requirements-common.txt --mount=type=bind,source=requirements-cuda.txt,target=requirements-cuda.txt --mount=type=bind,source=requirements-dev.txt,target=requirements-dev.txt --mount=type=bind,source=requirements-lint.txt,target=requirements-lint.txt --mount=type=bind,source=requirements-test.txt,target=requirements-test.txt pip3 install         -r requirements-cuda.txt         -r requirements-dev.txt": while running runtime: exit status 1

[dtrifiro]

This is going to pass after #122 is merged

[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@tjohnson31415: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/smoke-test	936e400ad71e802ae5e69e7bd062377f1d1a6619	link	true	/test smoke-test
ci/prow/images	49f5b01	link	true	/test images

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