Werk #15745: Checkmk now redacts site secrets during support diagnostics generation

Prior to this werk, generating a support diagnostic for deployments with distributed monitoring of multiple Checkmk instances would expose site secrets within the "etc/check_mk/multisite.d/sites.mk" file.

All site secrets are now replaced with "redacted" during the generation process of support diagnostics (Setup > Maintenance > Support diagnostics) where Checkmk Configuration files have been selected with at least low sensitivity or the sites.mk file has been selected individually.

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