Infinite scroll added checks to validate input

[darssen]

Fixes Warnings in Infinite scroll Module like:
Undefined array key "query_before"
Undefined array key "query_args"
Undefined array key "last_post_date"
118d8bdb2d4600db50a5c7b306828911-logstash

Proposed changes:

• Added isset check to validate inputs. Removed phpcs ignores, accordingly.

Testing instructions:

Code Review

[github-actions]

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[darssen]

I'm not sure this assign makes sense anymore since in line 756 we return early if 'DESC' !== $_REQUEST['query_args']['order']
@jeherve I see you have been working with Infinite Scroll in the past. Is line 756 a bug or should we directly do $operator = '<' ?

[bindlegirl]

It looks like the $operator and $last_post_date were supposed to be deprecated.

jetpack/projects/plugins/jetpack/modules/infinite-scroll/infinity.php

Lines 779 to 780 in d9973a1

	* @param string $operator @deprecated Query operator.
	* @param string $last_post_date @deprecated Last Post Date timestamp.