Add type feild to environment

[codecov[bot]]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (a1815eb) 38.92% compared to head (11164c3) 41.84%. Report is 4 commits behind head on master.

Files	Patch %	Lines
...n/apimgt/rest/api/admin/v1/dto/EnvironmentDTO.java	44.44%	5 Missing :warning:
...imgt/rest/api/publisher/v1/dto/EnvironmentDTO.java	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #12269 +/- ## ============================================ + Coverage 38.92% 41.84% +2.91% - Complexity 2925 3233 +308 ============================================ Files 1830 1830 Lines 134929 134942 +13 Branches 19487 19488 +1 ============================================ + Hits 52516 56461 +3945 + Misses 75942 71673 -4269 - Partials 6471 6808 +337 ``` | [Flag](https://app.codecov.io/gh/wso2/carbon-apimgt/pull/12269/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2) | Coverage Δ | | |---|---|---| | [integration_tests](https://app.codecov.io/gh/wso2/carbon-apimgt/pull/12269/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2) | `35.05% <70.00%> (+3.26%)` | :arrow_up: | | [unit_tests](https://app.codecov.io/gh/wso2/carbon-apimgt/pull/12269/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2) | `20.62% <0.00%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=wso2#carryforward-flags-in-the-pull-request-comment) to find out more.

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[Krishanx92]

Fix https://github.com/wso2/api-manager/issues/2490