chore: update common-lib

[Elessar1802]

Description

Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

Fixes https://github.com/devtron-labs/sprint-tasks/issues/2718

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Test A
• Test B

Checklist:

• The title of the PR states what changed and the related issues number (used for the release note).
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

This PR updates the @devtron-labs/devtron-fe-common-lib dependency and adds ArgoCD token-based authentication for development/testing purposes.

Key Changes:

• Downgrades common-lib from version 1.21.0-pre-1 to 1.20.6-alpha-88
• Introduces environment variable-based ArgoCD token authentication in the login flow

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
package.json	Updates common-lib dependency version from 1.21.0-pre-1 to 1.20.6-alpha-88
yarn.lock	Updates lockfile to reflect the new common-lib version and its dependency checksums
src/components/login/Login.tsx	Adds conditional authentication logic using VITE_ARGOCD_TOKEN environment variable to bypass SSO login

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