feat(to_dual): don't translate the order on `Set`

[JovanGerb]

This PR adds the tag attribute [to_dual_dont_translate] Set, as discussed in https://leanprover.zulipchat.com/#narrow/channel/287929-mathlib4/topic/Order.20dual.20tactic/near/560952736

It is not obvious where this tag should go, since Set and to_dual don't import eachother. A natural place seems to be the place where the sInf/sSup notations are declared for Set, since this is where one could start trying to use to_dual for translating the order on Set.

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[github-actions[bot]]

PR summary 1825e179b3

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ sInf_le_sInf + sSup_le_sSup

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for script/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[bryangingechen]

Could you add a comment explaining the attribute (possibly just linking to the Zulip post)?

Thanks! bors d+

[mathlib-bors[bot]]

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[JovanGerb]

bors r+

[mathlib-bors[bot]]

Pull request successfully merged into master.

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