Update Runtime Bugets and Step Hints

[fsschneider]

Depends on #830, #831, #832, and #833.

This PR updates the runtime budgets and step hints according to our working group discussion and issue #836.

For runtimes and step hints, I have always rounded up to the nearest integer.

The new budgets are:

External tuning

• Criteo 1TB: 7,703s (was 7,703s, no reduction)
• fastMRI: 4,430s (was 8,859s, reduced to 50%)
• ResNet: 66,159s (was 63,008s, extended by 5%)
• ViT: 69,768s (was 77,520s, reduced to 90%)
• Conformer: 58,015s (was 61,068s, reduced to 95%)
• DeepSpeech: 44,405s (was 55,506s, reduced to 80%)
• OGBG: 12,011s (was 18,477s, reduced to 65%)
• WMT: 43,336s (was 48,151s, reduced to 90%)

Self-tuning
Change the factor from 3x to 1.5x. This keeps the baseline and Schedule-free AdamW still within finite workload scores (except ResNet, which could not be achieved, even with the 3x budget).

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