Destroy Pipeline and all ShaderModule

[remmel]

• vkDestroyShaderModule : bug in the loop. Was always destory the 0th item
• vkDestroyPipeline : Pipeline::Release never call. Use destructor, like in the other structs

In order to avoid thoses warnings

VK_OBJECT_TYPE_SHADER_MODULE; | MessageID = 0x4872eaa0 | vkDestroyDevice(): OBJ ERROR : For VkDevice 0x21a28d16d50[], Vk
ShaderModule 0xcfef35000000000a[] has not been destroyed.

validation layer: Validation Error: [ VUID-vkDestroyDevice-device-05137 ] Object 0: handle = 0xd10d270000000018, type =
VK_OBJECT_TYPE_PIPELINE; | MessageID = 0x4872eaa0 | vkDestroyDevice(): OBJ ERROR : For VkDevice 0x232cccfd950[], VkPipel
ine 0xd10d270000000018[] has not been destroyed.

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All committers have signed the CLA.

[rpavlik-bot]

An issue (number 2506) has been filed to correspond to this pull request in the internal Khronos GitLab (Khronos members only: KHR:openxr/openxr#2506 ), to facilitate working group processes.

This GitHub pull request will continue to be the main site of discussion.

[rpavlik]

Just one minor tweak.

If you could also add a changelog fragment in changes/sdk/pr.538.gh.OpenXR-SDK-Source.md per the readme in there, that would be appreciated. If not I can try my hand at it.