[2242] Improve konduit.sh error handling

[saliceti]

Context

The script was not stopping when an error happened, which made it more difficult to troubleshoot errors

Changes proposed in this pull request

Make the script more robust by configuring "set -eu" to stop when there is an error and when a variable is not set

Guidance to review

Try konduit with various commands and arguments:

• scripts/konduit.sh apply-staging -- psql
• scripts/konduit.sh apply-staging -- redis-cli
• scripts/konduit.sh -a apply-review-10343 -- redis-cli
• scripts/konduit.sh apply-review-10343 -- pg_dump -E utf8 --clean --compress=1 --if-exists --no-owner --verbose --no-password -f bak.gz
• scripts/konduit.sh -c -i bak.gz apply-review-10343 -- psql
• scripts/konduit.sh -t 120 -n bat-qa apply-review-10343 -- psql
• scripts/konduit.sh -k s189t01-gse-stg-inf-kv -d gse-staging get-school-experience-staging -- psql
• scripts/konduit.sh -k s189t01-gse-stg-inf-kv -s s189t01-gse-stg-pg -d gse-staging get-school-experience-staging -- psql

After merging

Keep an eye on database workflows

Checklist

• I have performed a self-review of my code, including formatting and typos
• I have cleaned the commit history
• I have added the Devops label
• I have attached the pull request to the trello card

[RMcVelia]

all tests ran as expected