docs: fix worker billing, pod billing unit and job states

[justinwlin]

Three pages contradict the rest of the docs and the API. This fixes them so each fact has one public answer.

• Worker billing (serverless/workers/overview.mdx, serverless/pricing.mdx): the pricing page's "Start time: Initializing the container and loading models" read as if the worker table's Initializing state were billed, which it is not. Now both pages say the same thing: billing starts when a worker switches to Running and stops when it scales down. Image pull and cached-model downloads happen while Initializing and are not billed. Handler cold start, request processing and the idle timeout (shown as Running in the console) are billed.
• Pod billing unit (pods/overview.mdx, get-started/products.mdx): "billed by the minute" → "billed by the second", matching Pod pricing and Billing.
• Job states (serverless/endpoints/job-states.mdx): removes RUNNING. The job API reports IN_PROGRESS while a worker processes a job and never returns RUNNING.
• Idle costs (get-started/products.mdx, serverless/overview.mdx): "no idle costs" → workers bill while they run and scale down to zero when there are no requests. The idle timeout after each request is billed.

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