feat: filter deletion for case insensitive file renaming

[scolladon]

What does this pull request contains? Explain your changes.

---

• Added for new features.
• Changed for changes in existing functionality.
• Deprecated for soon-to-be removed features.
• Removed for now removed features.
• Fixed for any bug fixes.
• Security in case of vulnerabilities.

Explain your changes

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Filter from deletion "case only" file renaming

A	force-app/main/default/objects/Test__c/fields/ABC__c.field-meta.xml
D	force-app/main/default/objects/Test__c/fields/abc__c.field-meta.xml

Should generate only a package.xml (and not the destructiveChanges.xml) containing

<?xml version="1.0" encoding="UTF-8"?>
<Package xmlns="http://soap.sforce.com/2006/04/metadata">
    <types>
        <members>Test__c.ABC__c</members>
        <name>CustomField</name>
    </types>    
    <version>50.0</version>
</Package>

Does this close any currently open issues?

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closes #132

• Jest test to check the fix is applied are added.

Any other comments?

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Can be taken in any next release

Where has this been tested?

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Operating System: Darwin Kernel Version 18.7.0: Tue Jan 12 22:04:47 PST 2021; root:xnu-4903.278.56~1/RELEASE_X86_64

yarn version: 1.22.10

node version: v14.16.0

git version: git version 2.31.1

sfdx version: sfdx-cli/7.94.3 darwin-x64 node-v14.16.0

sgd plugin version: sfdx-git-delta 4.3.2

[codecov]

Codecov Report

Merging #133 (a449dd2) into master (ef45931) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #133   +/-   ##
=======================================
  Coverage   99.24%   99.25%           
=======================================
  Files          18       18           
  Lines         399      402    +3     
=======================================
+ Hits          396      399    +3     
  Misses          3        3           

Impacted Files	Coverage Δ
src/utils/repoGitDiff.js	100.00% <100.00%> (ø)

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