fix: write permissions in /usr/local/bin/vcr

[gorkarevilla]

This fix this: https://vonage.slack.com/archives/C02TC4RNZ9Q/p1761236283899269

With permissions:

root@cc64b39b84ea:/# curl -L https://raw.githubusercontent.com/Vonage/cloud-runtime-cli/fix/mac_writting_permissions/script/install.sh | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4414  100  4414    0     0  20459      0 --:--:-- --:--:-- --:--:-- 20530
######################################################################## 100.0%
vcr was installed successfully to /usr/local/bin/vcr
Run 'vcr --help' to get started

Without permissions, current MacOS in Vonage:

> curl -L https://raw.githubusercontent.com/Vonage/cloud-runtime-cli/fix/mac_writting_permissions/script/install.sh | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4414  100  4414    0     0  45290      0 --:--:-- --:--:-- --:--:-- 45505
######################################################################## 100.0%
vcr was installed successfully to /Users/gorkarevilla/.local/bin/vcr
Run 'vcr --help' to get started

Not in the PATH:

$ curl -L https://raw.githubusercontent.com/Vonage/cloud-runtime-cli/fix/mac_writting_permissions/script/install.sh | sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  4472  100  4472    0     0  20595      0 --:--:-- --:--:-- --:--:-- 20608
######################################################################## 100.0%
vcr was installed successfully to /home/testuser/.local/bin

⚠️  Warning: /home/testuser/.local/bin is not in your $PATH
Add the following to your $HOME/.bash_profile:
  export PATH="/home/testuser/.local/bin:$PATH"

Then you can run: vcr --help
$ echo $PATH
/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
$ vcr config
-sh: 4: vcr: not found
$ export PATH="/home/testuser/.local/bin:$PATH"
$ vcr -h
VCR CLI is a powerful command-line interface designed to streamline
and simplify the development and management of applications on 
the Vonage Cloud Runtime platform.

...

[Copilot]

Pull Request Overview

This PR improves the robustness of the VCR CLI installation script by implementing a fallback mechanism for installation locations. When the system-wide installation to /usr/local/bin fails due to permission issues, the script now attempts to install to user-local directories as alternatives.

• Enhanced installation logic with graceful fallback to user directories when system-wide installation fails
• Added user-friendly guidance for PATH configuration when installing to non-standard locations
• Improved error messages with clearer instructions for resolution

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