Update renovate regex to handle sylva-core source_templates exception

Loic Nicollerequested to merge
fix_renovate_source_template_regex into main

What does this MR do and why?

@tmmorin noticed this strange MR from renovate: !2814 (comment 2086424518)

this MR was wrongly created due to the merge of : !2794 (diffs) which change the definition of sylva-core source_template.

Due to this change the regex that try to identify the source_templates and their related url / reference broke leading to have sylva-core dependency using the tag of capi-rancher-import:

This MR fix it by adding the match of commit:

Test coverage

see: https://regex101.com/r/UHXOfk/1

Local test of renovate with this config:

               {
                 "depName": "https://gitlab.com/sylva-projects/sylva-core.git",
                 "currentValue": "not-a-real-commit",
                 "datasource": "git-tags",
                 "replaceString": "\n      url: https://gitlab.com/sylva-projects/sylva-core.git\n      ref:\n        # the sylva-core framework will always override this ref so that the\n        # currently checked out commit of sylva-core is used by sylva-units\n        # (you can grep the code for \"CURRENT_COMMIT\" to find out how)\n        commit: not-a-real-commit\n",
                 "updates": [],
                 "packageName": "https://gitlab.com/sylva-projects/sylva-core.git",
                 "versioning": "semver-coerced",
                 "warnings": [],
                 "skipReason": "invalid-value"
               },
               {
                 "depName": "https://gitlab.com/sylva-projects/sylva-elements/helm-charts/capi-rancher-import.git",
                 "currentValue": "0.1.5",
                 "datasource": "git-tags",
                 "replaceString": "\n      url: https://gitlab.com/sylva-projects/sylva-elements/helm-charts/capi-rancher-import.git\n      ref:\n        tag: 0.1.5\n",
                 "updates": [],
                 "packageName": "https://gitlab.com/sylva-projects/sylva-elements/helm-charts/capi-rancher-import.git",
                 "versioning": "semver-coerced",
                 "warnings": [],
                 "sourceUrl": "https://gitlab.com/sylva-projects/sylva-elements/helm-charts/capi-rancher-import",
                 "currentVersion": "0.1.5",
                 "fixedVersion": "0.1.5"
               },

as not-a-real-commit is not a semver tags it will be ignored

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