For dualstack and ipv6 the default ipv6 range should be same with the…

[oilbeater]

… ipv4 cidr.

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Bug fixes

Which issue(s) this PR fixes:

Fixes #(issue-number)

WHAT

copilot:summary

copilot:poem

HOW

copilot:walkthrough

[github-actions]

• The commit message should provide more information about the changes made in the patch.
• In the values.yaml file, the POD_CIDR, JOIN_CIDR, and SVC_CIDR values for ipv6 and dual_stack have been changed from /64 to /112. This change is necessary as /64 is too large for a single subnet and can cause issues with routing. However, it's important to ensure that these CIDRs do not overlap with each other or with any other networks in use.
• In the install.sh script, the same changes have been made to the POD_CIDR, JOIN_CIDR, and SVC_CIDR values for ipv6 and dual_stack. Again, it's important to ensure that these CIDRs do not overlap with each other or with any other networks in use.
• It's unclear why the PINGER_EXTERNAL_ADDRESS and PINGER_EXTERNAL_DOMAIN values have been changed in both files. If this change is necessary, it should be explained in the commit message.
• The SVC_YAML_IPFAMILYPOLICY variable has been added to the install.sh script for dual-stack deployments. However, it's unclear what this variable does and how it affects the deployment. More information should be provided in the commit message or in comments within the script.