fix(test/chores): Buildscripts and E2E script shebangs

[mhkarimi1383]

Pull Request template

Please, go through these steps before you submit a PR.

Why is this PR required? What issue does it fix?:

In some OSes bash is in different location (e.g. NixOS), So using /usr/bin/env bash is a better option

What this PR does?:

Changed shebangs from /bin/bash to /usr/bin/env bash

Does this PR require any upgrade changes?: No

If the changes in this PR are manually verified, list down the scenarios covered::

Any additional information for your reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Fixes #
• PR Title follows the convention of <type>(<scope>): <subject>
• Has the change log section been updated?
• Commit has unit tests
• Commit has integration tests
• (Optional) Are upgrade changes included in this PR? If not, mention the issue/PR to track:
• (Optional) If documentation changes are required, which issue on https://github.com/openebs/openebs-docs is used to track them:

PLEASE REMOVE BELOW INFORMATION BEFORE SUBMITTING

The PR title message must follow convention:
<type>(<scope>): <subject>.

Where:

• type is defining if release will be triggering after merging submitted changes, details in CONTRIBUTING.md.
  Most common types are:

  • feat - for new features, not a new feature for build script
  • fix - for bug fixes or improvements, not a fix for build script
  • chore - changes not related to production code
  • docs - changes related to documentation
  • style - formatting, missing semi colons, linting fix etc; no significant production code changes
  • test - adding missing tests, refactoring tests; no production code change
  • refactor - refactoring production code, eg. renaming a variable or function name, there should not be any significant production code changes

• scope is a single word that best describes where the changes fit.
  Most common scopes are like:

  • data engine (localpv, jiva, cstor)
  • feature (provisioning, backup, restore, exporter)
  • code component (api, webhook, cast, upgrade)
  • test (tests, bdd)
  • chores (version, build, log, travis)

• subject is a single line brief description of the changes made in the pull request.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.22%. Comparing base (8feeaa0) to head (271b185).
Report is 36 commits behind head on develop.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #351      +/-   ##
===========================================
- Coverage    98.66%   97.22%   -1.44%     
===========================================
  Files            2        2              
  Lines          673      902     +229     
===========================================
+ Hits           664      877     +213     
- Misses           5       18      +13     
- Partials         4        7       +3     

Flag	Coverage Δ
bddtests	97.22% <ø> (-1.44%)	⬇️

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