Print headlines in bot report comment

[IanButterworth]

I think it would be helpful to give the headlines in the report comment from the bot.
I haven't run this, but the goal is to look something like the collapsed form of the report.

A more compressed version may be possible.

[IanButterworth]

I can't figure out the error that's happening here.
Ah I see it's addressed/fixed in #190

[IanButterworth]

I wondered if this should be hidden within a collapsed <details> block?

[maleadt]

Probably, yes. There's also a relevant CI error.

[IanButterworth]

Is the remaining error new? I see it's on master too

┌ Info: Running as part of test suite, not uploading report
└   message = "upload report for PkgEvalJob JuliaLang/julia@468d5c2 vs. JuliaLang/julia@9a20417"
ERROR: LoadError: NanosoldierError: error when preparing/pushing to report repo: ArgumentError: '/home/runner/.julia/scratchspaces/89f34f1a-2e6b-52eb-a20f-77051b03b735/workdir/NanosoldierReports/pkgeval/by_hash/redacted_vs_redacted' exists. `force=true` is required to remove '/home/runner/.julia/scratchspaces/89f34f1a-2e6b-52eb-a20f-77051b03b735/workdir/NanosoldierReports/pkgeval/by_hash/redacted_vs_redacted' before copying.
Stacktrace:
 [1] nanosoldier_error(msg::String, err::ArgumentError)
   @ Nanosoldier ~/work/Nanosoldier.jl/Nanosoldier.jl/src/error.jl:16
 [2] report(job::PkgEvalJob, results::Dict{Any, Any})
   @ Nanosoldier ~/work/Nanosoldier.jl/Nanosoldier.jl/src/jobs/PkgEvalJob.jl:838
 [3] run(job::PkgEvalJob)
   @ Nanosoldier ~/work/Nanosoldier.jl/Nanosoldier.jl/src/jobs/PkgEvalJob.jl:740
 [4] top-level scope
   @ ~/work/Nanosoldier.jl/Nanosoldier.jl/test/runtests.jl:261
 [5] include(fname::String)
   @ Base.MainInclude ./client.jl:494
 [6] top-level scope
   @ none:6
in expression starting at /home/runner/work/Nanosoldier.jl/Nanosoldier.jl/test/runtests.jl:261