Remove unused `#error_explanation` id from error partials #7870

Job	Run time
build (production)	3m 26s
build (test)	3m 20s
End to End testing (3.0)	5m 13s
test (3.0, 1)	4m 0s
End to End testing (3.1)	3m 40s
Testing search (3.0, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	4m 10s
test (3.0, 2)	7m 46s
End to End testing (.ruby-version)	5m 51s
Testing search (3.1, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	6m 5s
test (3.0, 3)	6m 39s
Testing search (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:7.17.13)	6m 5s
test (3.0, 4)	5m 47s
Testing search (.ruby-version, docker.elastic.co/elasticsearch/elasticsearch:8.10.2)	3m 24s
test (3.1, 1)	5m 19s
test (3.1, 2)	7m 20s
test (3.1, 3)	8m 33s
test (3.1, 4)	5m 31s
test (.ruby-version, 1)	5m 8s
test (.ruby-version, 2)	5m 42s
test (.ruby-version, 3)	7m 50s
test (.ruby-version, 4)	5m 57s
	1h 56m 46s

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