Build repo: Move all `.sh` scripts from root folder to `scripts/` folder.

[prudhvigodithi]

Is your feature request related to a problem? Please describe

There are multiple bash scripts that are part of the root folder, there is an already exists scripts/ folder. It would be clean to move the .sh files from the root to folder and store them under scripts/.

Describe the solution you'd like

• Move all the .sh scripts that involve the workflows to scripts/ folder.

• Once migrated call the .sh file from the script folder. Example for release_notes.sh: Instead of ./release_notes.sh check manifests/2.2.0/opensearch-2.2.0.yml --date 2022-07-26 Run: ./scripts/release_notes.sh check manifests/2.2.0/opensearch-2.2.0.yml --date 2022-07-26

• To achieve this move run.sh, Pipfile Pipfile.lock to scripts/ folder.

• Modify the .sh scripts as follows Example release_notes.sh

  
  #!/bin/bash

SPDX-License-Identifier: Apache-2.0

#

The OpenSearch Contributors require contributions made to

this file be licensed under the Apache-2.0 license or a

compatible open source license.

set -e

DIR="$(dirname "$0")" "$DIR/run.sh" "$DIR/../src/run_releasenotes_check.py" $@

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

###  Acceptance Criteria 

- Move the bash scripts to a specific folder.
- Update the [libraries](https://github.com/opensearch-project/opensearch-build-libraries/tree/main/vars) to use the scripts from this folder (Example https://github.com/opensearch-project/opensearch-build-libraries/blob/main/vars/assembleManifest.groovy#L15)
- Update all the jenkinsfiles (part of the build repo and other repos used for one click release process) with the version of the library that use the scripts from this folder. 

[prudhvigodithi]

Can you please add your thoughts? This would clean the repo root folder and would better organize the scripts. @opensearch-project/engineering-effectiveness

[peterzhuamazon]

That is a huge change especially the build.sh/test.sh/assemble.sh/sign.sh etc. A lot of the libs and code needs to accommodate this change. Need to approach with caution, and I dont think it is very urgent to make this change right now.

[prudhvigodithi]

Similar related issue: https://github.com/opensearch-project/opensearch-build/issues/153

[vchrombie]

I would like to work on this

[vchrombie]

I identified 11 scripts as of now

$ ls | grep .sh
assemble.sh
build.sh
checkout.sh
ci.sh
manifests.sh
release_notes.sh
report.sh
run.sh
sign.sh
test.sh
validation.sh

I moved them to the scripts folder and I am updating the paths.