build: jenkins: archive-prerequisites.sh fails in with build configs

[Davlet Panech]

Brief Description
-----------------

The sub-job "download-prerequisites" conflicts with logic in "archive-misc". Both attempt to archive the "mirrors" directory in different ways. The relevant steps in download-prerequisites should probably be removed. This happens when re-building the same build:

1) download-prerequisites creates "mirrors" as a symlink
2) archive-misc deletes the symlink and creates a directory full of hardlinks in its place
3) ==> REBUILD the same build; this will use the same timestamped directory for the archive dir under /localdisk/loadbuil
4) Step (1) fails because there's already a directory (from step 3) at destination

Severity
--------
Minor

Steps to Reproduce
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1) Set ARCHIVE_BIG_DIRS="checksum-hardlink" in build.conf
2) Run Jenkins build
3) Re-run Jenkins build

Expected Behavior
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Both builds succeed

Actual Behavior
----------------
The re-build fails in the "download-prerequisites" job

Reproducibility
---------------
Reproducible

System Configuration
--------------------
N/A

Branch/Pull Time/Commit
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master/2023-07-27

Last Pass
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N/A

Timestamp/Logs
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12:48:43 + /var/lib/jenkins/workspace/dpanech/starlingx-jenkins-pipelines/parts/download-prerequisites/scripts/archive-prerequisites.sh
12:48:43 reading /localdisk/designer/jenkins/dpanech-wrcp-master/build.conf
12:48:43 cd /localdisk/designer/jenkins/dpanech-wrcp-master/repo/stx-tools
12:48:43 sourcing ./import-stx
12:48:43 + [[ -d /localdisk/designer/jenkins/dpanech-wrcp-master/mirrors ]]
12:48:43 + mkdir -p /localdisk/loadbuild/jenkins/dpanech-wrcp-master/2023-07-26_11-50-31
12:48:43 + ln -sfn /localdisk/designer/jenkins/dpanech-wrcp-master/mirrors /localdisk/loadbuild/jenkins/dpanech-wrcp-master/2023-07-26_11-50-31/
12:48:43 ln: ‘/localdisk/loadbuild/jenkins/dpanech-wrcp-master/2023-07-26_11-50-31/mirrors’: cannot overwrite directory

Test Activity
-------------
N/A

Workaround
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N/A