Make disk location required in sled-agent inventory and Nexus - #11628

control: job assigned to worker 01M6EWREAK9ASRRNB1M5VGC0CC [factory aws, i-05120ea6cdff1877c] (queued for 33 s)
...
task: starting task 0: "setup"
task: process exited: duration 19998 ms, exit code 0
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task: starting task 1: "rust-toolchain"
task: process exited: duration 8825 ms, exit code 0
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task: starting task 2: "authentication"
task: process exited: duration 2015 ms, exit code 0
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task: starting task 3: "clone repository"
task: process exited: duration 8866 ms, exit code 0
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task: starting task 4: "build"
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| + [[ linux == \i\l\l\u\m\o\s ]]
| + rm -rf /var/tmp/omicron_tmp/crdb-base-build
| + unset TMPDIR
| + echo 'files in /var/tmp/omicron_tmp (none expected on success):'
| files in /var/tmp/omicron_tmp (none expected on success):
| + find /var/tmp/omicron_tmp -ls
|    258336     28 drwxr-xr-x   2 build    build       24576 Nov  2 20:19 /var/tmp/omicron_t [...]
| + rmdir /var/tmp/omicron_tmp
task: process exited: duration 1912994 ms, exit code 0
|W| found 5 output files
|W| uploading: /work/cargo-build-analysis.jsonl (1826594 bytes)
|W| uploaded: /work/cargo-build-analysis.jsonl
|W| uploading: /work/environment.json (108 bytes)
|W| uploaded: /work/environment.json
|W| uploading: /work/oxidecomputer/omicron/target/nextest/ci/junit.xml (649493 bytes)
|W| uploaded: /work/oxidecomputer/omicron/target/nextest/ci/junit.xml
|W| uploading: /tmp/nextest-run-archive.zip (3308035 bytes)
|W| uploaded: /tmp/nextest-run-archive.zip
|W| uploading: /tmp/nextest-chrome-trace.json (4514999 bytes)
|W| uploaded: /tmp/nextest-chrome-trace.json