General cleanup policy for branches & builds

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In the settings (in the UI or using Casc), have the possibility to define a global cleanup policy for branches & builds.

The administrator can define a list of "project cleanup polices":

• a list of regular expressions (includes/excludes) identifying the target projects. If a project is identified by several policies, only the first one is taken into account
• a list of "branch cleanup policies"

Each branch cleanup policy consists of:

• a list of regular expressions (includes/excludes) identifying the target branches. If a branch is identified by several policies, only the first one is taken into account. Both the Ontrack branch name (for example: release-1.1) and the display name (typically a Git name like release/1.1) are taken into account by the regular expressions.
• a cleanup policy among:
  • KEEP - always keep this branch
  • DISABLE - always disable this branch
  • KEEP_LAST - keep the last N branches. N is configurable and branches are ordered by decreasing semantic version
  • KEEP_IF_ACTIVE - keeping the branches if it's been active in the last N days, N being configurable. The last activity of the branch is computed using the creation time of its last build.
  • Other policies can be defined later on using the Ontrack extension mechanism