Deduplicate SHOW_ELAPSED_TIME properties to address v8r error

[proinsias]

Proposed Changes

If you run the v8r tool on a .mega-linter.yml file that contains a SHOW_ELAPSED_TIME key, you will get the following error:

ℹ Processing .mega-linter.yml
ℹ Found schema in https://www.schemastore.org/api/json/catalog.json ...
ℹ Validating .mega-linter.yml against schema from https://raw.githubusercontent.com/megalinter/megalinter/main/megalinter/descriptors/schemas/megalinter-configuration.jsonschema.json ...
✖ reference "http://github.com/oxsecurity/megalinter-configuration.json#/properties/SHOW_ELAPSED_TIME" resolves to more than one schema

This is because the megalinter/descriptors/schemas/megalinter-configuration.jsonschema.json file has two SHOW_ELAPSED_TIME properties due to a typo. This PR fixes this typo.

Readiness Checklist

Author/Contributor

• Add entry to the CHANGELOG listing the change and linking to the corresponding issue (if appropriate)
• If documentation is needed for this change, has that been included in this pull request

Reviewing Maintainer

• Label as breaking if this is a large fundamental change
• Label as either automation, bug, documentation, enhancement, infrastructure, or performance

[nvuillam]

Good catch, thanks for your contribution :)