[DNM]fix deleted state for bgp_global

[Ruchip16]

SUMMARY

fixes the issue customer is facing while deleting neighbors in bgp_global, when the customer provides just one neighbor (e.g., 192.168.253.4), the module deletes all neighbors not present in want, even though the user intends to delete just that one.

The proposed changes in this PR, only delete explicitly defined neighbors in the want dictionary and do not infer deletion of other neighbors.

Fixes ANA-733

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

iosxr_bgp_global

ADDITIONAL INFORMATION

Problem user facing when using state deleted:

- name: Delete only one BGP neighbor
  cisco.iosxr.iosxr_bgp_global:
    config:
      as_number: 65137
      neighbors:
        - neighbor_address: 192.168.253.4
    state: deleted

user configuration on device:

router bgp 65137
  neighbor 192.168.253.1
  neighbor 192.168.253.2
  neighbor 192.168.253.3
  neighbor 192.168.253.4

Expected outcome (Now the output is this after the changes done in PR):

router bgp 65137
no neighbor 192.168.253.4

Actual outcome (before the changes made in PR):

router bgp 65137
no neighbor 192.168.253.1
no neighbor 192.168.253.2
no neighbor 192.168.253.3
no neighbor 192.168.253.4

[Ruchip16]

pre-commit.ci autofix

[KB-perByte]

Hold merge, as we disussed not to include granular deletion for this module at this stage.