fix: Skip dummy medusa/eagle tests when WORLD_SIZE env variable is missing

[brb-nv]

Description

This addresses https://nvbugspro.nvidia.com/bug/5301221.

We unset WORLD_SIZE env variable while running tests in specific cluster nodes to deal with a bug in transformers library. Trainer initialization in get_dummy_spec_decoding_heads() function fails if WORLD_SIZE is unset. Preemptively skip tests if WORLD_SIZE is unset.

Alternative:
Setting WORLD_SIZE during Trainer's init (#4742) - I'm avoiding this as it could pollute the env.

Test Coverage

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[brb-nv]

/bot run

[tensorrt-cicd]

PR_Github #7008 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #7008 [ run ] completed with state SUCCESS
/LLM/release-0.20/L0_MergeRequest_PR pipeline #132 completed with status: 'FAILURE'

[brb-nv]

/bot run

[tensorrt-cicd]

PR_Github #7087 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #7087 [ run ] completed with state SUCCESS
/LLM/release-0.20/L0_MergeRequest_PR pipeline #139 completed with status: 'FAILURE'

[brb-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #7096 Bot args parsing error: usage: /bot [-h]
{run,kill,skip,submit,reviewers,reuse-pipeline,reuse-review} ...
/bot: error: unrecognized arguments: disable-fail-fast

[tensorrt-cicd]

PR_Github #7099 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #7099 [ run ] completed with state SUCCESS
/LLM/release-0.20/L0_MergeRequest_PR pipeline #145 completed with status: 'FAILURE'

[SimengLiu-nv]

/bot skip --comment "Fail on an unknown error that's unrelated to the PR."

[tensorrt-cicd]

PR_Github #7107 Bot args parsing error: Failed to parse bot args

[SimengLiu-nv]

/bot skip --comment "Pipeline passes for related tests. The failure is on a known CI issue."

[tensorrt-cicd]

PR_Github #7109 [ skip ] triggered by Bot

[tensorrt-cicd]

PR_Github #7109 [ skip ] completed with state SUCCESS
Skipping testing for commit 581fbb0

[brb-nv]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #7145 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #7145 [ run ] completed with state SUCCESS
/LLM/release-0.20/L0_MergeRequest_PR pipeline #150 completed with status: 'FAILURE'

[brb-nv]

/bot skip --comment "Failing tests unrelated to incoming changes."

[tensorrt-cicd]

PR_Github #7150 [ skip ] triggered by Bot

[tensorrt-cicd]

PR_Github #7150 [ skip ] completed with state SUCCESS
Skipping testing for commit 0c51b3f