Disabling automatic creation of IP-in-IP tunnels by SWSS (#2019)

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#### Why I did it
Due to some issues observed in production, we have decided to disable
automatic creation of IP-in-IP decap rules during SWSS startup for
loopback, interface, and VLAN IPs.

##### Work item tracking
- Microsoft ADO **(number only)**: 36937332

#### How I did it
Modified `ipinip.json.j2` so that no IP-in-IP decap rules are created
for loopback, interface, and VLAN IPs.

#### How to verify it
1. Replace `/usr/share/sonic/templates/ipinip.json.j2` inside the SWSS
container with the file modified in this PR.
2. Run `sudo config reload -y`.
3. Confirm that there are no IP-in-IP decap rules in
`/etc/swss/config.d/ipinip.json` inside the SWSS container:
```
$ docker exec swss cat /etc/swss/config.d/ipinip.json
[

]
```
4. Confirm that there are no IP-in-IP tunnels created in APPL DB:
```
$ sonic-db-cli APPL_DB KEYS *TUNNEL*

```

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#### Description for the changelog
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pull request for inclusion in the changelog:
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Disabling automatic creation of IP-in-IP tunnels by SWSS.

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#### Link to config_db schema for YANG module changes
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N/A

---------

Signed-off-by: Mahdi Ramezani <mramezani@microsoft.com>
Co-authored-by: Kumaresh Perumal <kperumal@microsoft.com>

Author: mramezani95

dockers/docker-orchagent/ipinip.json.j2

@@ -52,6 +52,16 @@
         {%- set ipv6_vlan_addresses = ipv6_vlan_addresses.append(prefix) %}
     {%- endif %}
 {% endfor %}
+{# Generation of IP-in-IP decap entries is disabled for BackEnd device types. #}
+{%- set backend_device_types = ['BackEndToRRouter', 'BackEndLeafRouter'] -%}
+{% if 'type' in DEVICE_METADATA['localhost'] and DEVICE_METADATA['localhost']['type'] in backend_device_types %}
+{% set ipv4_addresses = [] %}
+{% set ipv6_addresses = [] %}
+{% set ipv4_vlan_addresses = [] %}
+{% set ipv6_vlan_addresses = [] %}
+{% set ipv4_loopback_addresses = [] %}
+{% set ipv6_loopback_addresses = [] %}
+{% endif %}
 {%- set ipv4_addresses = ipv4_addresses + ipv4_vlan_addresses %}
 {%- set ipv6_addresses = ipv6_addresses + ipv6_vlan_addresses %}
 {# SAI report tunnel TABLE_FULL for large topo. Only generating for VLAN and loopback if over 128 routed interfaces.#}