Update OLS URLs to OLS4

[twalsh-ebi]

Description

This PR would update the configuration of OLS URLs to OLS4.

The main effect of this would be on search functionality in the Ensembl Glossary page.

Views affected

The following table breaks down the expected impact of this pull request.

variable	module	comments
OLS_REST_API	EnsEMBL::Web::Component::Help::Glossary	Used in glossary search form, where the updated URL helps restore glossary search functionality.
OLS_REST_API	SiteDefs	Used to set prefix of ENSEMBL_GLOSSARY_REST variable.
ENSEMBL_GLOSSARY_REST	EnsEMBL::Web::Component::Help::Glossary Component::Help::Glossary	Used only to check if Ontology Lookup Service is available.
ENSEMBL_GLOSSARY_REST	EnsEMBL::Web::ConfigPacker	Used during packing of ENSEMBL_GLOSSARY metadata. When ENSEMBL_GLOSSARY metadata was repacked with and without the changes in this PR, the packed ENSEMBL_GLOSSARY metadata was identical.
ENSEMBL_GLOSSARY_URL	EnsEMBL::Web::Apache::Handlers	Used to support glossary redirect functionality, which is unchanged by this pull request.

Example of changed functionality:

• Glossary search functionality: search the Ensembl Glossary for a term such as 'GENCODE' on sandbox and live sites

Examples of unchanged functionality:

• Glossary redirect functionality: access the Ensembl Glossary term 'GENCODE' on sandbox and live sites, with both redirecting to the OLS page for the GENCODE term.

Possible complications

None anticipated.

Merge conflicts

None detected.

Related JIRA Issues (EBI developers only)

N/A

[azangru]

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