fix open files issue and bump firesim with various fixes

[sagark]

Fix the open files limit issue automatically for systems that have a sufficient hard limit, but insufficient soft limit (e.g. all millennium machines).

Also, many fixes from firesim/firesim#1266

Related PRs / Issues:
N/A

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you mark the PR with a changelog: label?

[jerryz123]

The plan is to merge this script now as a temporary thing, then by the next release, the top level setup script will be modified to also do everything this script currently does.

[jerryz123]

Approved, with the understanding that the first-setup-fast script will be merged into the build-setup script in future PRs

a