Convert LDAP username (#12461)

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 Convert LDAP username #12021

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

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 Fix conversion var use

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

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 Fix LDAP uid conversion test

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

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 Remove comments with ref to PR

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

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 Remove unnecessary paranthesis

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>

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 Move space in conversion string

Signed-off-by: mathieu.brunot <mathieu.brunot@monogramm.io>