Run the tests for the 'odoc' package only

[Julow]

• The parser package can't its tests run because of a circular dependency with ppx_expect.
• Run tests from Odoc's build script. This is the build script that Dune would have generated.

However:

• This increase the Dune version 2.8, which breaks esy

[jonludlam]

Only because the esy overrides don't have dune 2.8 yet: https://github.com/esy-ocaml/esy-opam-override/tree/6/packages

[coveralls]

Pull Request Test Coverage Report for Build 179

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 63.791%

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Totals
Change from base Build 178:	0.0%
Covered Lines:	6508
Relevant Lines:	10202

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💛 - Coveralls