CircleCI: Update macos xcode versions

[algobarb]

Summary

• CircleCI is deprecating the medium and large macos resource classes. Instead we are replacing it with macos.x86.medium.gen2. There is no equivalent of large except for macos.m1.large.gen1 but it's an M1 machine and not an amd macos. It's also much more expensive.
• Changed the M1 self-hosted runner name to resource_class: algorand/macstadium-m1

Test Plan

• Test that nightly jobs run as expected: https://app.circleci.com/pipelines/github/algorand/go-algorand/15602/workflows/5b59119b-0cd7-459a-b2a8-814b22de5c48
• During testing, I had to modify scripts/configure_dev.sh once and then revert it back:

scripts/configure_dev.sh change

    # Change the conditional from != to == once and then revert back
    if [ "${CIRCLECI}" == "true" ]; then
        install_or_upgrade jq
        install_or_upgrade autoconf
        install_or_upgrade automake
        install_or_upgrade python3
        install_or_upgrade lnav
        install_or_upgrade diffutils
        lnav -i "$SCRIPTPATH/algorand_node_log.json"
    fi

[codecov]

Codecov Report

Merging #5590 (94a1bfe) into master (d316914) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #5590      +/-   ##
==========================================
- Coverage   55.79%   55.77%   -0.02%     
==========================================
  Files         446      446              
  Lines       63418    63418              
==========================================
- Hits        35381    35373       -8     
- Misses      25668    25676       +8     
  Partials     2369     2369              

see 14 files with indirect coverage changes

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