tests: remove 'set -x' from "Run spread tests" step in Tests workflow

[sergiocazzolato]

We need to remove the 'set -x' because it is including in the output a huge list of tests when doing

spread_list="$($SPREAD -list $RUN_TESTS 2>&1 || true)"

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Please upload report for BASE (master@c4ff9e7). Learn more about missing BASE report. Report is 290 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #15062   +/-   ##
=========================================
  Coverage          ?   78.11%           
=========================================
  Files             ?     1177           
  Lines             ?   157300           
  Branches          ?        0           
=========================================
  Hits              ?   122870           
  Misses            ?    26811           
  Partials          ?     7619           

Flag	Coverage Δ
unittests	78.11% <ø> (?)

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[github-actions[bot]]

Wed Feb 12 15:39:18 UTC 2025 The following results are from: https://github.com/canonical/snapd/actions/runs/13272429104

Failures:

Executing:

• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:restart
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:close
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:ignore
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh:parallel
• openstack:opensuse-tumbleweed-64:tests/main/snap-refresh-hold
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-pre-download:close_mid_restart
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh:regular
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-gating
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-gating-from-snap
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-backoff
• openstack:opensuse-tumbleweed-64:tests/main/auto-refresh-retry
• openstack:opensuse-tumbleweed-64:tests/main/refresh-app-awareness-notify
• google-arm:ubuntu-core-22-arm-64:tests/core/services
• google-core:ubuntu-core-22-64:tests/core/gadget-update-pc
• google:ubuntu-25.04-64:tests/upgrade/basic
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-serial-port
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-helper
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-strict-enforced
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-required-or-optional
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-self-manage
• google:ubuntu-25.04-64:tests/main/security-device-cgroups:uinput
• google:ubuntu-25.04-64:tests/main/security-device-cgroups:kmsg
• google:ubuntu-25.04-64:tests/main/cgroup-devices-v2
• google:ubuntu-22.04-64:tests/main/uc20-create-partitions

Restoring:

• openstack:opensuse-tumbleweed-64:tests/main/refresh-app-awareness-notify
• google-core:ubuntu-core-22-64:tests/core/gadget-update-pc
• google-core:ubuntu-core-22-64:tests/core/
• google-core:ubuntu-core-22-64
• google:ubuntu-25.04-64:tests/main/security-device-cgroups-strict-enforced

[ernestl]

Failures not related to the change.