Do not restart for every item during Teleporter import of Local DNS record or CNAME

[yubiuser]

• I have read and understood the contributors guide, as well as this entire template.
• I have made only one major change in my proposed changes.
• I have commented my proposed changes within the code.
• I have tested my proposed changes.
• I am willing to help maintain this change if there are issues with it later.
• I give this submission freely and claim no ownership.
• It is compatible with the EUPL 1.2 license
• I have squashed any insignificant commits. (git rebase)
• I have Signed Off all commits. (git commit --signoff)

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What does this PR aim to accomplish?:

Do not restart Pi-hole for every entry in local DNS records or CNAME during Teleporter import.
So far, Pi-hole did a full restart while deleting each individual entry (if clear data was selected) and on each entry import.
Fixes: https://github.com/pi-hole/pi-hole/issues/4077

Needs: pi-hole/pi-hole#4384

How?
Adds a flag "reload" which is passed down to the webpage.sh. For each step it is set to false. After all removal/importing is done, it sets the new variable fullpiholerestart to true which will finally do the full restart

[DL6ER]

Only merge when pi-hole/pi-hole#4384 is merged

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-11-web-v5-8-and-core-v5-6-released/50566/1