invalid macsec link metadata minigraph xml generation

- regression added by https://github.com/Azure/sonic-mgmt.msft/commit/05a6979b0e0228c3840d5c6b6cd4545e684c7a88
- with **macsec_card=True** generating invalid minigraph xml( missing declaration tag )
- generating below xml without declaration
`
`
- below is the valid xml
`




`

Proposed fix:
- We need to back port the changes of https://github.com/sonic-net/sonic-mgmt/pull/17530
or
- revert problematic line https://github.com/Azure/sonic-mgmt.msft/blob/202405/ansible/templates/minigraph_link_meta.j2#L3

invalid generated xml without declaration tags
`




MacSecEnabled
True


ARISTA01T3:Ethernet1;cmp214-5:Ethernet5/1





MacSecEnabled
True


ARISTA01T3:Ethernet2;cmp214-5:Ethernet7/1

`

Inspect ansible/templates/minigraph_link_meta.j2 at line 3 and compare its output when macsec_card=True with the valid XML shown in the issue. Confirm the generated minigraph contains LinkMetadataDeclaration and Link wrappers around each LinkMetadata entry; completion means the output is valid XML with the declaration tags present.

Written by the indexing model from the issue text.